| City, 
                State County Country | Intersection (Lat, Lng) | Type Status | Control Type / Other Control Type | Approaches / Driveways / ICD (m) | Functional Class / LaneType | Year Completed | Comments | 
|---|---|---|---|---|---|---|---|
| Maple Valley,
                WA King Co. United States | SE 240th Blvd. / 228th Ave. SE (47.38734, -122.03723) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 33.5280 | Other (At-Grade) Single-Lane | 2018 | Southwest leg stubbed. Year Completed estimated (2017-2018). | 
| Maple Valley,
                WA King Co. United States | 228th Ave. SE / SE 275th Pl. / SE Bear Blvd. (47.35485, -122.03766) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 27.4320 | Other (At-Grade) Single-Lane | 2017 | Year Completed estimated (2016-2017). | 
| Sammamish,
                WA King Co. United States | SE 4th St. / 224th Pl. SE (47.60552, -122.03916) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 26.2128 | Other (At-Grade) Single-Lane | 2020 | |
| Sammamish,
                WA King Co. United States | SE 4th St. / 224th Ave. SE (47.60553, -122.04091) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 25.6032 | Other (At-Grade) Single-Lane | 2020 | |
| Issaquah,
                WA King Co. United States | SE 62nd St. / 221st Pl. SE / 4th Ave. NW (47.54682, -122.04277) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 28.2155 | Other (At-Grade) Single-Lane | 2019 | https://www.youtube.com/watch?v=FGdBuaAZqVU. https://www.issaquahwa.gov/62. ICD estimated from Google Maps linework. | 
| Lake Stevens,
                WA Snohomish Co. United States | (unknown) (48.01194, -122.04305) | Roundabout Existing | All-Way Yield None | 2 Approaches 0 Driveways 30.4800 | Other (At-Grade) Single-Lane | 2009 | Entrance to Lake Stevens Community Park. January 2009. | 
| Sammamish,
                WA King Co. United States | SE 4th St. / 222nd Pl. SE (47.60554, -122.04307) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 19.8120 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2020 | |
| Maple Valley,
                WA King Co. United States | Witte Rd. SE / SE 248th St. (47.37966, -122.04813) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 36.5760 | Other (At-Grade) Single-Lane | 2011 | January 2011. | 
| Maple Valley,
                WA King Co. United States | Witte Rd. SE / SE 254th Pl. (47.37383, -122.04867) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 36.5760 | Other (At-Grade) Single-Lane | 2024 | https://www.maplevalleywa.gov/departments-services/public-works/capital-improvement-projects/current-transportation-improvement-projects/t-28b-ph-3-south-witte-road-se-roundabout-improvements | 
| Sammamish,
                WA King Co. United States | SE 4th St. / 218th Ave. SE (47.60555, -122.04899) | Roundabout Existing | All-Way Yield Unknown | 3 Approaches 0 Driveways 21.9453 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2020 | |
| Issaquah,
                WA King Co. United States | SE 62nd St. / Lake Dr. / Pickering Pl. (47.54599, -122.04930) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 22.5728 | Other (At-Grade) Single-Lane | 2019 | https://www.youtube.com/watch?v=FGdBuaAZqVU. https://www.issaquahwa.gov/62. ICD estimated from Google Maps linework. | 
| Issaquah,
                WA King Co. United States | Maple St. NW / (parking lots) (47.54340, -122.05121) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 20.9614 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2017 | ICD estimated from Google Maps linework. | 
| Sammamish,
                WA King Co. United States | NE Inglewood Hill / 216th Ave. NE (47.61554, -122.05180) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 31.3989 | Other (At-Grade) Single-Lane | 2001 | October 2001. ICD estimated from Google Maps linework. | 
| Issaquah,
                WA King Co. United States | East Lake Sammamish Parkway / SE 43rd Way (47.56792, -122.05500) | Roundabout Existing | Unknown Unknown | 3 Approaches 0 Driveways 38.6799 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2009 | ICD estimated from Google Maps linework. | 
| Issaquah,
                WA King Co. United States | 19th Ave. NW / NW Gilman Blvd. (47.54571, -122.06644) | Other Existing | All-Way Yield None | 3 Approaches 0 Driveways 21.7667 | Other (At-Grade) Single-Lane | 19th Ave legs have painted splitter islands. Completed 2008 or earlier (streetview). ICD estimated from Google Maps linework. | |
| Pleasant Hill,
                CA Contra Costa Co. United States | Old Quarry Rd. / Camelback Rd. (37.97273, -122.06894) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 30.1278 | Other (At-Grade) Single-Lane | 2017 | Year Completed estimated (2017-2018). https://www.eastbaytimes.com/2017/02/20/pleasant-hill-roundabout-planned-near-diablo-valley-college/ ICD estimated from Google Maps linework. | 
| Issaquah,
                WA King Co. United States | Newport Way NW / NW Pacific Elm Dr. / 200th Ave. SE (47.54989, -122.07416) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 26.6016 | Other (At-Grade) Single-Lane | 2018 | ICD estimated from Google Maps linework. | 
| Hayward,
                CA Alameda Co. United States | Orchard Ave. / Joyce St. (37.65808, -122.07850) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 18.9103 | Other (At-Grade) Single-Lane | 2000 | Painted splitter islands. Built as temporary in February 2000, reconstructed permanent central island 2001 (http://ci.hayward.ca.us/citygov/meetings/cca/rp/2000/rp091900-05.pdf). ICD estimated from Google Maps linework. | 
| Lake Stevens,
                WA Snohomish Co. United States | SR 92 / 113th Ave. SE (48.03019, -122.07884) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 35.9412 | Other (At-Grade) Single-Lane | 2013 | Reverse curves on east and west approaches. Open November 2013. ICD estimated from Google Maps linework. | 
| Redmond,
                WA King Co. United States | NE Union Hill Rd. / 196th Ave. NE (47.67501, -122.07901) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 48.7680 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2012 | Open September 2012. | 
| Redmond,
                WA King Co. United States | NE Novelty Hill Rd. / 195th Ave. NE (47.68845, -122.07993) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 38.5909 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2012 | Open October 2012. ICD estimated from Google Maps linework. | 
| Cupertino,
                CA Santa Clara Co. United States | Cristo Rey Dr. / Hammond Way / Canyon Oak Way (37.33058, -122.08070) | Roundabout Existing | All-Way Yield None | 5 Approaches 0 Driveways 36.0875 | Other (At-Grade) Single-Lane | 2000 | Functional Class: Local ICD estimated from Google Maps linework. | 
| Lake Stevens,
                WA Snohomish Co. United States | Lundeen Park Way / Callow Rd. / Lakeview Dr. / Vernon Rd. (48.01797, -122.09050) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 31.9553 | Other (At-Grade) Single-Lane | 2006 | http://www1.co.snohomish.wa.us/Departments/Public_Works/Services/Roads/Projects/LundeenCallow.htm. Opened June 2006. ICD estimated from Google Maps linework. | 
| Fairfield,
                CA Solano Co. United States | Rockville Rd. / Abernathy Rd. (38.24598, -122.09074) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 23.4495 | Other (At-Grade) Single-Lane | 2005 | ICD estimated from Google Maps linework. | 
| Lafayette,
                CA Contra Costa Co. United States | Olympic Blvd. / Pleasant Hill Rd. (37.88604, -122.09300) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 33.5280 | Other (At-Grade) Single-Lane | 2017 | Yield-controlled right-turn bypass lanes on north and east legs. Painted splitter island on south leg. | 
| Lake Stevens,
                WA Snohomish Co. United States | SR 92 / 99th Ave NE (48.02885, -122.09804) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 37.5396 | Other (At-Grade) Single-Lane | 2013 | Reverse curves on east and west approaches. Open November 2013. ICD estimated from Google Maps linework. | 
| Bellevue,
                WA King Co. United States | W Lake Sammamish Pkwy SE / I-90 WB Ramps (47.56690, -122.09947) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 139.9998 | Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified) | 2013 | Open November 2013. Raindrop shape. | 
| Bellevue,
                WA King Co. United States | W. Lake Sammamish Pkwy. SE / Lakemont Blvd. SE (47.56776, -122.09980) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 35.4567 | Other (At-Grade) Single-Lane | 1997 | Revised August 2005. Previously controlled by two-way stop Functional Class: Arterial ICD estimated from Google Maps linework. | 
| Lake Stevens,
                WA Snohomish Co. United States | Lundeen Parkway / Soper Hill Rd. (48.01557, -122.10010) | Roundabout Existing | Unknown Unknown | 4 Approaches 0 Driveways 29.5601 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2010 | ICD estimated from Google Maps linework. | 
| Snohomish,
                WA Snohomish Co. United States | Ave. D / Bickford Ave. / 15th St. (47.93037, -122.10101) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 79.2238 | Other (At-Grade) Single-Lane | 2014 | Open July 2014. ICD estimated from Google Maps linework. | 
| Snohomish,
                WA Snohomish Co. United States | SR 9 / Bickford Ave. (47.93379, -122.10107) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 38.1000 | Other (At-Grade) Single-Lane | 2022 | WSDOT safety project that was completed in early Sept 2022. Includes right-turn bypass lane for NB to EB movement | 
| Covington,
                WA King Co. United States | SE Wax Rd. / 180th Ave. SE / SE 267th Pl. (47.36216, -122.10200) | Roundabout Existing | All-Way Yield None | 5 Approaches 0 Driveways 53.3935 | Other (At-Grade) Single-Lane | 2008 | September 2008. ICD estimated from Google Maps linework. | 
| West Lake Stevens,
                WA Snohomish Co. United States | SR 9 / S Lake Stevens Rd. (47.97461, -122.10273) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Multilane (2 Lane, 2x1 max) | 2022 | https://www.tiktok.com/@j_will_entrepreneur/video/7151997176799939883?is_from_webapp=v1&item_id=7151997176799939883 | 
| Lake Stevens,
                WA Snohomish Co. United States | Lake Dr. / 29th St. NE (48.02479, -122.10383) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 24.3840 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2017 | |
| Auburn,
                WA King Co. United States | SE 392nd St. / (parking lot) (47.24986, -122.10399) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 28.3750 | Other (At-Grade) Single-Lane | 2012 | ICD estimated from Google Maps linework. | 
| Lake Stevens,
                WA Snohomish Co. United States | N Davies Rd. / Frontier Village Access Rd. (48.00472, -122.10462) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 18.2880 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2012 | Painted splitter islands. Open July 2012. | 
| Lake Stevens,
                WA Snohomish Co. United States | N Davies Rd. / Vernon Rd. / Frontage Rd. (48.00477, -122.10589) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 19.8120 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2023 | Originally opened July 2012. Shifted to east 2022-2023 as part of construction of SR 9/Vernon Rd roundabout. | 
| Lake Stevens,
                WA Snohomish Co. United States | SR 9 / SR 204 (Snohomish Marysville Rd.) / 7th Pl. NE (48.00286, -122.10637) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 45.7200 | Other (At-Grade) Multilane (2 Lane, 2x2 max) | 2023 | https://www.youtube.com/watch?v=5RRqjCCJjRc | 
| Lake Stevens,
                WA Snohomish Co. United States | SR 9 / Vernon Rd. (48.00461, -122.10670) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 45.7200 | Other (At-Grade) Multilane (2 Lane, 2x2 max) | 2023 | https://www.youtube.com/watch?v=5RRqjCCJjRc | 
| Lake Stevens,
                WA Snohomish Co. United States | Vernon Rd. / 91st Ave. SE (48.00354, -122.10817) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 24.3840 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2022 | Peanut shaped. ICD = 80 ft for each node, 185 ft for overall length. No deflection on north and south legs prior to entry. https://www.reddit.com/r/Suburbanhell/comments/y403wy/a_new_peanut_shaped_roundabout_my_city_just/?rdt=48505 | 
| Redmond,
                WA King Co. United States | NE 116th St. / 172nd Ave. NE (47.70403, -122.11106) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 30.5420 | Other (At-Grade) Single-Lane | 2015 | Open April 2015. ICD estimated from Google Maps linework. | 
| Marysville,
                WA Snohomish Co. United States | SR 9 / 84th St. NE / Getchell Rd. (48.07196, -122.11135) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 39.6240 | Other (At-Grade) Single-Lane | 2014 | Right-turn-only lanes on all four legs. Open October 2014. | 
| Palo Alto,
                CA Santa Clara Co. United States | E Meadow Dr. / Ross Rd. (37.42600, -122.11139) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 13.2785 | Other (At-Grade) Single-Lane | 2018 | ICD estimated from Google Maps linework. | 
| Marysville,
                WA Snohomish Co. United States | SR 9 / 108th St NE (48.09180, -122.11180) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 39.6240 | Other (At-Grade) Single-Lane | 2020 | Year Completed estimated (2018-2020). | 
| Covington,
                WA King Co. United States | 172nd Ave. SE / SE 270th Pl. (47.35939, -122.11240) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 34.7885 | Other (At-Grade) Single-Lane | 2001 | ICD estimated from Google Maps linework. | 
| Arlington,
                WA Snohomish Co. United States | SR 531 (172nd St NE) / SR 9 (48.15166, -122.11325) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 40.6373 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2012 | Open October 2012. ICD estimated from Google Maps linework. | 
| Covington,
                WA King Co. United States | 168th Pl. SE / Fred Meyer Entrance (47.35698, -122.11680) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 105.1794 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2008 | November 2008. Entrance into Fred Meyer shopping center. ICD estimated from Google Maps linework. | 
| Covington,
                WA King Co. United States | 168th Pl. SE / Costco Entrance (47.35463, -122.11860) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 39.6463 | Other (At-Grade) Single-Lane | 2008 | November 2008. Entrance into Costco shopping center. ICD estimated from Google Maps linework. | 
| Lake Stevens,
                WA Snohomish Co. United States | Soper Hill Rd. / 83rd Ave. NE (48.02162, -122.11931) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 22.8600 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2020 | https://www.heraldnet.com/news/soper-hill-roundabout-and-pedestrian-trail-work-wraps-up/ | 
| Eastgate,
                WA King Co. United States | SE Newport Way / 164th Ave. SE (47.57236, -122.12142) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 19.5072 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2019 | https://dev.bellevuewa.gov/sites/default/files/media/pdf_document/levy-164th-SE-newport-way-roundabout-mailer-2018.pdf | 
| Redmond,
                WA King Co. United States | NE 76th St. / 164th Ave. NE (47.67214, -122.12180) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 99.7242 | Other (At-Grade) Single-Lane | 2012 | Oblong shape. Connected two T-intersections on either side of median to allow crossing and left-turn movements. Open December 2012. ICD estimated from Google Maps linework. | 
| Covington,
                WA King Co. United States | SE 256th St. / 164th Ave. SE (47.37256, -122.12290) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 50.1477 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2007 | Open September 2007. ICD estimated from Google Maps linework. | 
| Redmond,
                WA King Co. United States | NE 116th St. / 162nd Ave. NE (47.70420, -122.12313) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 116.5413 | Other (At-Grade) Single-Lane | 2014 | Open May 2014. ICD estimated from Google Maps linework. | 
| Arlington,
                WA Snohomish Co. United States | E. Division St. / N. Broadway St. (48.19858, -122.12530) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 23.8824 | Other (At-Grade) Single-Lane | 2002 | September 2002. ICD estimated from Google Maps linework. | 
| Arlington,
                WA Snohomish Co. United States | 204 St. NE / 77th Ave. NE (48.18082, -122.12637) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2021 | Elliptical shaped. http://www.arlingtonwa.gov/643/204th-St-NE-77th-Avenue-NE-Roundabout | 
| Arlington,
                WA Snohomish Co. United States | W. Division St. / N. West Ave. (48.19864, -122.12800) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 27.8628 | Other (At-Grade) Single-Lane | 2002 | September 2002. ICD estimated from Google Maps linework. | 
| Bellevue,
                WA King Co. United States | SE 46th Way / 157th Ave. SE (47.56285, -122.13218) | Traffic Calming Circle Existing | One-Way/Two-Way Stop None | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | ||
| Redmond,
                WA King Co. United States | 152nd Ave. NE / NE 36th Pl. / NE 31st St. (47.63828, -122.13550) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 27.3615 | Other (At-Grade) Single-Lane | 2010 | Near Microsoft campus. Moderate ped/bike volumes. ICD estimated from Google Maps linework. | 
| Kendall,
                WA Whatcom Co. United States | SR 542 / SR 547 (Kendall Corner) (48.91692, -122.13767) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 34.5337 | Other (At-Grade) Single-Lane | 2015 | Open September 2015. ICD estimated from Google Maps linework. | 
| Woodinville,
                WA King Co. United States | SR 202 / Village Dr. / NE 144th St. (47.73111, -122.14040) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 38.4048 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2009 | Constructed as single-lane roundabout in October 2009 and expanded to include second lane northbound in 2021. | 
| Woodinville,
                WA King Co. United States | SR 202 / NE 145th St. / 148th Ave. NE (47.73271, -122.14220) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 47.2440 | Other (At-Grade) Multilane (2 Lane, 2x1 max) | 2009 | October 2009. | 
| Arlington,
                WA Snohomish Co. United States | SR 530 / 211th Pl. NE (48.18852, -122.14376) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2023 | https://www.arlingtonwa.gov/735/SR-530---59th-211th-Roundabouts | 
| Woodinville,
                WA King Co. United States | SR 202 / (parking) (47.73280, -122.14400) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 33.5280 | Other (At-Grade) Single-Lane | 2009 | October 2009. | 
| Bellevue,
                WA King Co. United States | Landerholm Rd. / South Perimeter Cir. (47.58438, -122.14600) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 33.8343 | Other (At-Grade) Single-Lane | 2003 | Opened July 2003. Entrance to Bellevue Community College. ICD estimated from Google Maps linework. | 
| Renton,
                WA King Co. United States | SE 176th St. / SE 171st Way (47.44500, -122.14831) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 23.4239 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2019 | Mini-roundabout in a suburban neighborhood context, completed November 2019. ICD estimated from Google Maps linework. | 
| Palo Alto,
                CA Santa Clara Co. United States | Park Blvd. / Park Ave. (37.43076, -122.14980) | Traffic Calming Circle Existing | Unknown Unknown | 3 Approaches 0 Driveways 24.6585 | Other (At-Grade) Single-Lane | Functional Class: Local ICD estimated from Google Maps linework. | |
| Arlington Bluff,
                WA Snohomish Co. United States | SR 530 / 59th Ave. NE (48.18839, -122.15068) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2023 | https://www.arlingtonwa.gov/735/SR-530---59th-211th-Roundabouts | 
| Orinda,
                CA Contra Costa Co. United States | Hall Dr. / Donald Dr. (37.86411, -122.15310) | Traffic Calming Circle Existing | All-Way Yield Unknown | 5 Approaches 0 Driveways 17.9148 | Other (At-Grade) Single-Lane | 2002 | ICD estimated from Google Maps linework. | 
| Palo Alto,
                CA Santa Clara Co. United States | Addison Ave. / Bryant St. (37.44197, -122.15540) | Traffic Calming Circle Existing | Unknown Unknown | 4 Approaches 0 Driveways 15.1722 | Other (At-Grade) Single-Lane | Functional Class: Local ICD estimated from Google Maps linework. | |
| Eastgate,
                WA King Co. United States | SE 40th St. / 138th Ave. SE (47.57459, -122.15670) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 40.2865 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2019 | Mini-roundabout adjacent Tyee Middle School, completed October 2019. ICD estimated from Google Maps linework. | 
| Palo Alto,
                CA Santa Clara Co. United States | Lytton Ave. / Fulton St. (37.45214, -122.15750) | Traffic Calming Circle Existing | Unknown Unknown | 4 Approaches 0 Driveways 9.4813 | Other (At-Grade) Single-Lane | Functional Class: Local ICD estimated from Google Maps linework. | |
| Mill Creek,
                WA Snohomish Co. United States | SE 116th St. / 56th Ave SE (47.89201, -122.15856) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 80.8842 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2012 | Open August 2012. ICD estimated from Google Maps linework. | 
| Woodinville,
                WA King Co. United States | 136th Ave. NE / Woodinville High School Entrance (47.77161, -122.15860) | Roundabout Existing | Unknown Unknown | 3 Approaches 0 Driveways 25.6862 | Other (At-Grade) Single-Lane | 2003 | Opened October 2003. ICD estimated from Google Maps linework. | 
| Woodinville,
                WA King Co. United States | NE 171st St. / 135th Ave. NE (47.75063, -122.15921) | Roundabout Existing | All-Way Yield None | 3 Approaches 1 Driveways 36.5760 | Other (At-Grade) Single-Lane | 2017 | Year Completed estimated (2017-2018). | 
| Stanford,
                CA Santa Clara Co. United States | Campus Dr. / Serra St. (37.42679, -122.15944) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 45.5257 | Other (At-Grade) Single-Lane | 2018 | https://transportation.stanford.edu/news/stanfords-fifth-roundabout-open-serra-street-and-campus-drive-east ICD estimated from Google Maps linework. | 
| Stanford,
                CA Santa Clara Co. United States | Campus Dr. / Escondido Rd. (37.42427, -122.16053) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 19.9182 | Other (At-Grade) Single-Lane | 2014 | ICD estimated from Google Maps linework. | 
| Woodinville,
                WA King Co. United States | NE 171st St. / 131st Ave. NE / (parking) (47.75074, -122.16148) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 36.5760 | Other (At-Grade) Single-Lane | 2018 | Year Completed estimated (2018-2019). | 
| Stanford,
                CA Santa Clara Co. United States | Campus Dr. / Bowdoin St. (37.42271, -122.16149) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 27.5066 | Other (At-Grade) Single-Lane | 2015 | ICD estimated from Google Maps linework. | 
| Marysville,
                WA Snohomish Co. United States | Shoultes Rd. / 51st Ave. NE / 108th St. NE (48.09268, -122.16210) | Roundabout Existing | Unknown Unknown | 4 Approaches 0 Driveways 29.5158 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2006 | Opened September 2006. ICD estimated from Google Maps linework. | 
| Stanford,
                CA Santa Clara Co. United States | Galvez St. / Arboretum Rd. (37.43602, -122.16281) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2019 | Right-turn bypass lane on northeast leg; through bypass lane on southwest leg. Year Completed estimated (2018-2020). | 
| Stanford,
                CA Santa Clara Co. United States | Campus Dr. / Galvez St. (37.43156, -122.16420) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 32.2453 | Other (At-Grade) Single-Lane | 2016 | ICD estimated from Google Maps linework. | 
| Marysville,
                WA Snohomish Co. United States | 92nd St. NE / 48th Dr. NE (48.07907, -122.16566) | Traffic Calming Circle Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 13.7160 | Other (At-Grade) Single-Lane | ||
| Bonney Lake,
                WA Pierce Co. United States | 198th Ave. E / Cascadia Blvd. E (47.12299, -122.16688) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 44.6959 | Other (At-Grade) Single-Lane | 2008 | Fourth (southeast) leg added 2018. ICD estimated from Google Maps linework. | 
| Bothell,
                WA Snohomish Co. United States | SR 524 (Maltby Rd.) / (unknown) (47.80956, -122.16689) | Roundabout Existing | All-Way Yield Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | 2020 | |
| Marysville,
                WA Snohomish Co. United States | 92nd St. NE / 46th Dr. NE (48.07910, -122.16836) | Traffic Calming Circle Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 13.7157 | Other (At-Grade) Single-Lane | ||
| Marysville,
                WA Snohomish Co. United States | 3rd St. / Union Ave. (48.05088, -122.16967) | Traffic Calming Circle Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2016 | |
| Marysville,
                WA Snohomish Co. United States | 2nd St. / Union Ave. (48.04996, -122.16967) | Traffic Calming Circle Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2017 | |
| Marysville,
                WA Snohomish Co. United States | 3rd St. / Quinn Ave. (48.05089, -122.17141) | Traffic Calming Circle Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2016 | |
| Marysville,
                WA Snohomish Co. United States | 2nd St. / Quinn Ave. (48.04997, -122.17142) | Traffic Calming Circle Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2017 | |
| Arlington,
                WA Snohomish Co. United States | SR 531 (172nd St. NE) / 43rd Ave. NE (48.15231, -122.17230) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Multilane (2 Lane, 2x1 max) | 2022 | https://www.arlingtonwa.gov/758/43rd-Ave-SR-531-172nd-St-Roundabout | 
| Marysville,
                WA Snohomish Co. United States | 3rd St. / Alder Ave. (48.05090, -122.17315) | Traffic Calming Circle Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2016 | |
| Marysville,
                WA Snohomish Co. United States | 2nd St. / Alder St. (48.04998, -122.17357) | Traffic Calming Circle Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2017 | |
| Bonney Lake,
                WA Pierce Co. United States | Cascadia Blvd E / Canyon View Blvd. E (47.12810, -122.17464) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 44.6916 | Other (At-Grade) Single-Lane | 2008 | ICD estimated from Google Maps linework. | 
| Auburn,
                WA King Co. United States | 124 Ave. SE / SE 304th St. (47.32978, -122.17640) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 33.1891 | Other (At-Grade) Single-Lane | 2008 | July 2008. ICD estimated from Google Maps linework. | 
| Marysville,
                WA Snohomish Co. United States | SR 529 (48.04425, -122.18013) | Roundabout Existing | All-Way Yield None | 2 Approaches 0 Driveways 45.7200 | Other (At-Grade) Single-Lane | 2025 | |
| Bonney Lake,
                WA Pierce Co. United States | Cascadia Blvd E. / Forest Park Blvd. E (47.12820, -122.18033) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 39.0035 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2014 | Open December 2014. ICD estimated from Google Maps linework. | 
| Stanford,
                CA Santa Clara Co. United States | Campus Dr. / Santa Teresa St. (37.42678, -122.18140) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 26.5567 | Other (At-Grade) Single-Lane | 2015 | ICD estimated from Google Maps linework. | 
| Plateau,
                WA King Co. United States | Auburn Way / (school entrance) / (parking) (47.28822, -122.18165) | Roundabout Existing | All-Way Yield Unknown | 3 Approaches 1 Driveways 0.0000 | Other (At-Grade) Multilane (2 Lane, 2x1 max) | 2022 | Entrance to Chinook elementary school. | 
| Marysville,
                WA Snohomish Co. United States | 34th Ave. NE-Quil Ceda Blvd. / Tulalip Casino entrance (48.08801, -122.18560) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 74.9927 | Other (At-Grade) Single-Lane | 2001 | Opened October 2001 as multilane roundabout. Modified April 2014 to reduce to single-lane roundabout with right-turn-only lanes. ICD estimated from Google Maps linework. 21442 | 
| Marysville,
                WA Snohomish Co. United States | 34th Ave. NE / Quil Ceda Blvd. (48.10637, -122.18610) | Roundabout Existing | Unknown Unknown | 3 Approaches 0 Driveways 35.0906 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2007 | Opened May 2007. ICD estimated from Google Maps linework. |