| City, 
                State County Country | Intersection (Lat, Lng) | Type Status | Control Type / Other Control Type | Approaches / Driveways / ICD (m) | Functional Class / LaneType | Year Completed | Comments | 
|---|---|---|---|---|---|---|---|
| Salinas,
                CA Monterey Co. United States | Iris Dr. / Lupin Dr. (36.69330, -121.65378) | Traffic Calming Circle Existing | One-Way/Two-Way Stop None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2018 | |
| Salinas,
                CA Monterey Co. United States | Iris Dr. / Heather Cir. (36.69339, -121.65642) | Traffic Calming Circle Existing | One-Way/Two-Way Stop None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2018 | |
| Salinas,
                CA Monterey Co. United States | S Riker St. / Nissen Rd. (36.65955, -121.66437) | Traffic Calming Circle Existing | One-Way/Two-Way Stop None | 4 Approaches 1 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2018 | |
| Salinas,
                CA Monterey Co. United States | S Riker St. / Woodside Dr. (36.66051, -121.66402) | Traffic Calming Circle Existing | One-Way/Two-Way Stop None | 3 Approaches 1 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2018 | |
| Salinas,
                CA Monterey Co. United States | S Riker St. / Orange Dr. (36.66228, -121.66338) | Traffic Calming Circle Existing | One-Way/Two-Way Stop None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2018 | |
| Salinas,
                CA Monterey Co. United States | S Riker St. / W Romie Ln. (36.66382, -121.66284) | Traffic Calming Circle Existing | One-Way/Two-Way Stop None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2018 | |
| San Luis Obispo,
                CA San Luis Obispo Co. United States | Orcutt Rd. / Ranch House Rd. (35.26134, -120.63978) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 32.0040 | Other (At-Grade) Single-Lane | 2019 | Elliptical shaped. ICD = 105 ft x 100 ft. Driveway between crosswalk and entrance line on east leg. | 
| Merced,
                CA Merced Co. United States | E Olive Ave. / Campus Pkwy. (37.31778, -120.42305) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 53.3400 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2021 | http://www.mercedgwnews.com/new-roundabout-to-open-in-merced-this-is-the-location/ | 
| Soledad,
                CA Monterey Co. United States | Metz Rd. / East St. (36.42803, -121.32308) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2021 | https://salinasvalleytribune.com/soledad-unveils-areas-first-roundabout-intersection/ | 
| San Diego,
                CA San Diego Co. United States | Surface Navy Blvd. / S 32nd St. (32.68369, -117.12563) | Roundabout Existing | All-Way Yield Other | 3 Approaches 0 Driveways 45.7200 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2010 | Inside Naval Base San Diego. Entrance station on north leg. Year Completed estimated (2009-2010). | 
| Watsonville,
                CA Santa Cruz Co. United States | SR 129 (Riverside Rd.) / Lakeview Rd. (36.91682, -121.73169) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2021 | https://pajaronian.com/new-roundabout-at-hwy-129-lakeview-road-opens/ | 
| San Luis Obispo,
                CA San Luis Obispo Co. United States | Righotti Ranch Rd. / Tiburon Way (35.25548, -120.63902) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 30.4800 | Other (At-Grade) Single-Lane | 2020 | |
| Yosemite National Park,
                CA Mariposa Co. United States | Northside Dr. / Village Dr. (37.74508, -119.58351) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 41.1480 | Other (At-Grade) Single-Lane | 2017 | https://goldrushcam.com/sierrasuntimes/index.php/news/local-news/9914-yosemite-national-park-implements-a-new-roundabout-in-the-yosemite-village-parking-area | 
| Vista,
                CA San Diego Co. United States | S Santa Fe Ave. / Pala Vista Dr. (33.19467, -117.23597) | Roundabout Existing | All-Way Yield None | 3 Approaches 1 Driveways 33.5280 | Other (At-Grade) Single-Lane | 2021 | Open to traffic 2021 but incomplete. Year Completed estimated (2021-2022). | 
| Inglewood,
                CA Los Angeles Co. United States | District Dr. / Stadium Dr. / (parking) (33.94672, -118.34036) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 32.0037 | Other (At-Grade) Single-Lane | 2020 | At So-Fi Stadium. Yield-controlled right-turn bypass lane leading to add lane at crosswalk. Year Completed estimated (2019-2020). | 
| Rancho,
                CA Shasta Co. United States | Shasta View Dr. / (future roads) (40.53000, -122.31770) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 30.4800 | Other (At-Grade) Single-Lane | 2021 | |
| Rancho,
                CA Shasta Co. United States | Shasta View Dr. / San Pablo St. (40.52636, -122.31709) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 30.4800 | Other (At-Grade) Single-Lane | 2021 | |
| Rancho,
                CA Shasta Co. United States | Shasta View Dr. / (unknown) (40.52310, -122.31469) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2021 | |
| Shasta Lake,
                CA Shasta Co. United States | Smith Ave. / Jorsack Way / Rosstay Way (40.66503, -122.36168) | Other Existing | All-Way Yield None | 4 Approaches 0 Driveways 30.4800 | Other (At-Grade) Single-Lane | 2006 | Crosswalks are at unmarked entrance lines. | 
| Clearlake Oaks,
                CA Lake Co. United States | SR 20 / SR 53 (39.00852, -122.61426) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 45.7200 | Other (At-Grade) Single-Lane | 2019 | Merging right-turn bypass lanes on all legs. Year Completed estimated (2019-2020). | 
| Chico,
                CA Butte Co. United States | E Eaton Rd. / SR 99 NB Ramps / Hicks Ln. (39.77520, -121.87224) | Roundabout Existing | All-Way Yield None | 5 Approaches 0 Driveways 0.0000 | Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified) | 2022 | |
| Walnut,
                CA Orange Co. United States | Colorado (St.) (33.71340, -117.79113) | Other Existing | Unknown Unknown | 5 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | Havard Square Park. | |
| San Clemente,
                CA Orange Co. United States | Las Posas / Pavoreal (33.46890, -117.63108) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| San Juan Capistrano,
                CA Orange Co. United States | Camino de Vista / Camino de Vista (33.46871, -117.66820) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| San Juan Capistrano,
                CA Orange Co. United States | Paseo del Mar / Camino de Vista (33.46897, -117.67050) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| San Juan Capistrano,
                CA Orange Co. United States | Paseo del Mar / (unknown) (33.46956, -117.66737) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| San Juan Capistrano,
                CA Orange Co. United States | Via Angelina / Via Pimienta (33.49441, -117.67731) | Other Existing | Unknown Unknown | 2 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | ||
| San Juan Capistrano,
                CA Orange Co. United States | Via Angelica / Via Egan (33.49524, -117.67899) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | ||
| La Jolla,
                CA San Diego Co. United States | Union Place Circle (32.84600, -117.27010) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| Camp Pendleton South,
                CA San Diego Co. United States | Volcan Rd. / Jamul Dr. (33.22510, -117.38293) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | No splitter islands. | |
| San Marcos,
                CA San Diego Co. United States | Village Dr. / Carnation Ct. (33.12285, -117.16747) | Other Existing | Other Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | Mix of stop and yield control. | |
| UC Irvine,
                CA Orange Co. United States | Arroyo Vista (33.64610, -117.82633) | Other Existing | Unknown Unknown | 2 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| Hollister,
                CA San Benito Co. United States | SR 25 / SR 156 (36.89565, -121.42733) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 78.0288 | Other (At-Grade) Multilane (3+ Lane) | 2024 | Rotor turbo roundabout. Opened December 2023; fully operational February 2024. https://www.sfgate.com/local/article/gilroy-california-turbo-roundabout-18585736.php | 
| Santa Ynez,
                CA Santa Barbara Co. United States | SR 154 / Edison St. (34.63374, -120.08102) | Roundabout Unknown | All-Way Yield None | 4 Approaches 0 Driveways 46.0248 | Other (At-Grade) Single-Lane | Anticipated opening year Spring of 2024. | |
| Westpark,
                CA Placer Co. United States | Mayhill Dr. / Ardley Dr. (38.77507, -121.36969) | Other Existing | Unknown Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | No splitter islands. | |
| Westpark,
                CA Placer Co. United States | Mayhill Dr. / Parkham Dr. (38.77222, -121.36546) | Other Existing | Unknown Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | No splitter islands. | |
| Westpark,
                CA Placer Co. United States | Wharton Ln. (38.77188, -121.37325) | Other Existing | Unknown Unknown | 2 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| Junction West,
                CA Placer Co. United States | Camino Real Way / Camino Real Way (38.76573, -121.35364) | Other Existing | All-Way Stop Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| Cirby Side,
                CA Placer Co. United States | Somer Ridge Dr. / (parking) (38.72754, -121.28342) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| Elk Grove,
                CA Sacramento Co. United States | Nassa Circle (38.40333, -121.41259) | Other Existing | Unknown Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | Pedestrian access to central island. | |
| (unincorporated),
                CA Sacramento Co. United States | Bonito Circle (38.39719, -121.40355) | Other Existing | Unknown Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | Pedestrian access to central island. | |
| (unincorporated),
                CA San Joaquin Co. United States | SR 88 / E Liberty Rd. (38.23596, -121.05106) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2021 | https://www.facebook.com/CaltransDistrict10/posts/caltrans-begins-roundabout-project-on-state-route-88-at-liberty-road-near-clemen/3922838604435956/ | 
| San Luis Obispo,
                CA San Luis Obispo Co. United States | Tank Farm Rd. / Orcutt Rd. (35.25030, -120.62523) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2022 | https://www.slocity.org/government/department-directory/public-works/programs-and-services/capital-improvement-projects/roundabouts | 
| Azusa,
                CA Los Angeles Co. United States | E Boxwood Ln. / Ortuno Dr. (34.14304, -117.89763) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | Pedestrian access to central island. | |
| Santa Maria,
                CA Santa Barbara Co. United States | W Beacon Way / Madison Ln. (34.93382, -120.45941) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | No splitter islands. | |
| Sea View Estates,
                CA Ventura Co. United States | Patterson Rd. / Dunkirk Dr. (34.19617, -119.20799) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 42.6720 | Other (At-Grade) Single-Lane | 2005 | Year Completed estimated (2004-2005). | 
| Sea View Estates,
                CA Ventura Co. United States | Dunkirk Dr. / Halifax Ln. (34.19623, -119.21003) | Traffic Calming Circle Existing | One-Way/Two-Way Stop Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | ||
| Sea View Estates,
                CA Ventura Co. United States | Dunkirk Dr. / Lazaro Ln. (34.19627, -119.21144) | Traffic Calming Circle Existing | One-Way/Two-Way Stop Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | ||
| Channel Islands,
                CA Ventura Co. United States | Seabridge Ln. / Tradewinds Dr. (34.18993, -119.22479) | Other Existing | Unknown Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| Channel Islands,
                CA Ventura Co. United States | Tradewinds Dr. (34.18994, -119.22822) | Other Existing | Unknown Unknown | 2 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| Channel Islands,
                CA Ventura Co. United States | Harbour Island Ln. / Napoli Dr. (34.18259, -119.22287) | Other Existing | Uncontrolled Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | ||
| Port Hueneme,
                CA Ventura Co. United States | Las Palomas Dr. / (unknown) (34.17900, -119.21096) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| Coronado,
                CA San Diego Co. United States | Bay Circle (32.68240, -117.16935) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Multilane (2 Lane, unspecified) | ||
| Gilroy,
                CA Santa Clara Co. United States | SR 152 (Hecker Pass Rd.) / Plum St. (37.01188, -121.61789) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 45.7200 | Other (At-Grade) Single-Lane | 2021 | Year Completed estimated (2021-2022). | 
| Gilroy,
                CA Santa Clara Co. United States | 3rd St. / Plum St. / Lone Oak Ct. / Autumn Way (37.01070, -121.61792) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 30.4800 | Other (At-Grade) Single-Lane | 2016 | |
| Gilroy,
                CA Santa Clara Co. United States | 3rd St. / Grassland Way (37.00993, -121.61497) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 30.4800 | Other (At-Grade) Single-Lane | 2016 | |
| Gilroy,
                CA Santa Clara Co. United States | Santa Teresa Blvd. / Ballybunion Dr. / W Luchessa Ave. (36.99343, -121.59516) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 56.3880 | Other (At-Grade) Single-Lane | 2019 | Right-turn-only lanes on north and south legs. Appears to be designed for future multilane 2x1 configuration. | 
| Gilroy,
                CA Santa Clara Co. United States | W Luchessa Blvd. / Merlot Dr. (36.99410, -121.59300) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 36.5760 | Other (At-Grade) Single-Lane | 2019 | Year Completed estimated (2018-2019). | 
| Gilroy,
                CA Santa Clara Co. United States | Merlot Dr. / Yawi Pl. (36.99562, -121.59380) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 36.5760 | Other (At-Grade) Single-Lane | 2019 | Year Completed estimated (2018-2019). | 
| Gilroy,
                CA Santa Clara Co. United States | W Luchessa Ave. / W 10th St. (36.99065, -121.58528) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 36.5760 | Other (At-Grade) Single-Lane | 2016 | |
| Gilroy,
                CA Santa Clara Co. United States | W 10th St. / Charles Lux Dr. (36.99160, -121.58385) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 36.5760 | Other (At-Grade) Single-Lane | 2016 | |
| Gilroy,
                CA Santa Clara Co. United States | W Luchessa Ave. / Miller Ave. (36.99209, -121.58788) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 36.5760 | Other (At-Grade) Single-Lane | 2021 | Year Completed estimated (2020-2021). | 
| Gilroy,
                CA Santa Clara Co. United States | W Luchessa Ave. / Thomas Rd. (36.99107, -121.57357) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 42.6720 | Other (At-Grade) Multilane (2 Lane, 2x1 max) | 2014 | Year Completed estimated (2014-2015). | 
| Gilroy,
                CA Santa Clara Co. United States | Loma Ranch St. / W 10th St. (36.98989, -121.58674) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 36.5760 | Other (At-Grade) Single-Lane | 2019 | Year Completed estimated (2018-2019). | 
| San Anselmo,
                CA Marin Co. United States | San Francisco Blvd. / Santa Cruz Ave. (37.98566, -122.56572) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 12.1920 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2019 | Painted splitter islands. Year Completed estimated (2018-2019). | 
| Carpinteria,
                CA Santa Barbara Co. United States | Ogan Rd. / Via Real / US 101 NB On-Ramp (34.40144, -119.51551) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 38.1000 | Freeway Ramps (Grade-Separated) Single-Lane | 2020 | https://www.coastalview.com/news/roadways-open-with-improvements/article_979e3586-c6f1-11ea-bc84-b3d50932177b.html | 
| Salinas,
                CA Monterey Co. United States | E Alisal St. / Alisal Rd. / Bardin Rd. (36.67331, -121.60192) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 39.6240 | Other (At-Grade) Single-Lane | 2022 | Year Completed estimated (2021-2022). | 
| Salinas,
                CA Monterey Co. United States | Alisal Rd. / Sconberg Pkwy. (36.67234, -121.60073) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 39.0144 | Other (At-Grade) Single-Lane | 2022 | Year Completed estimated (2021-2022). | 
| Rohnert Park,
                CA Sonoma Co. United States | Commerce Blvd. / Southwest Blvd. (38.33615, -122.71171) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2022 | https://www.pressdemocrat.com/article/news/rohnert-park-roundabout-completed-opens-wednesday/?artslide=0 | 
| Belmont Shore,
                CA Los Angeles Co. United States | Ravenna Dr. / Corinthian Walk / The Toledo (33.75451, -118.12361) | Other Existing | Unknown Unknown | 6 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| Long Beach,
                CA Los Angeles Co. United States | Aquarium Way (33.76301, -118.19609) | Other Existing | Unknown Unknown | 2 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | ||
| Laguna,
                CA Sacramento Co. United States | Coney Island Circle (38.40992, -121.47661) | Other Existing | Unknown Unknown | 2 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| Hercules,
                CA Contra Costa Co. United States | Maybeck Ln. / Craftsman Dr. (38.02209, -122.26706) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | No splitter islands. | |
| Fountain Valley,
                CA Orange Co. United States | (unknown) / (unknown) (33.72539, -117.95204) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| Buena Park,
                CA Orange Co. United States | Lakeside Dr. (33.87506, -117.98083) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | Connection to multiuse path. | |
| Shasta Hanchett Park,
                CA Santa Clara Co. United States | Tillman Ave. / Hanchett Ave. (37.32998, -121.91643) | Traffic Calming Circle Existing | One-Way/Two-Way Stop Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | ||
| Shasta Hanchett Park,
                CA Santa Clara Co. United States | Martin Ave. / Sequoia Ave. (37.33046, -121.91387) | Other Existing | Unknown Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | ||
| Shasta Hanchett Park,
                CA Santa Clara Co. United States | Martin Ave. / Tillman Ave. (37.32929, -121.91560) | Other Existing | Unknown Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | ||
| Shasta Hanchett Park,
                CA Santa Clara Co. United States | Tillman Ave. / Sierra Ave. (37.32858, -121.91476) | Traffic Calming Circle Existing | One-Way/Two-Way Stop Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | ||
| Shasta Hanchett Park,
                CA Santa Clara Co. United States | Tillman Ave. / Yosemite Ave. (37.32791, -121.91395) | Traffic Calming Circle Existing | One-Way/Two-Way Stop Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | ||
| Anaheim,
                CA Orange Co. United States | S Manchester Ave. (33.80065, -117.90323) | Other Existing | Unknown Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | ||
| Alamo,
                CA Contra Costa Co. United States | Danville Blvd. / Orchard Ct. (37.85201, -122.03374) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 30.4800 | Other (At-Grade) Single-Lane | 2024 | https://www.contracosta.ca.gov/8130/Danville-BlvdOrchard-Ct-Project-Alamo-Ro | 
| San Diego,
                CA San Diego Co. United States | Central Ave. / Landis St. (32.74593, -117.10821) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 21.3360 | Other (At-Grade) Single-Lane | 2022 | |
| San Diego,
                CA San Diego Co. United States | Landis St. / 41st St. (32.74591, -117.10699) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 24.3840 | Other (At-Grade) Single-Lane | 2021 | Painted splitter islands. https://www.facebook.com/story.php/?story_fbid=4970374723032587&id=1462392140497547 | 
| San Diego,
                CA San Diego Co. United States | Landis St. / 42nd St. (32.74588, -117.10452) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 24.3840 | Other (At-Grade) Single-Lane | 2021 | Painted splitter islands. | 
| San Diego,
                CA San Diego Co. United States | W Point Loma Blvd. / Bacon St. / Levee St. (32.75330, -117.24549) | Roundabout Existing | All-Way Yield Rectangular Rapid Flashing Beacon (RRFB) | 4 Approaches 0 Driveways 19.8120 | Other (At-Grade) Single-lane w/ Traversable Central Island | 2022 | https://www.youtube.com/watch?v=PrXLfuEFHCE | 
| San Diego,
                CA San Diego Co. United States | Meade Ave. / Marlborough Ave. (32.75707, -117.10613) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 21.3360 | Other (At-Grade) Single-Lane | 2021 | Painted splitter islands on north and south legs. Pedestrian crossings adjacent to circulatory roadway on east and south legs. | 
| San Diego,
                CA San Diego Co. United States | Meade Ave. / Central Ave. (32.75713, -117.10825) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 21.3360 | Other (At-Grade) Single-Lane | 2021 | Painted splitter island on north leg. One-way street entrance on south leg. | 
| San Diego,
                CA San Diego Co. United States | Meade Ave. / 39th St. (32.75712, -117.11041) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 21.3360 | Other (At-Grade) Single-Lane | 2021 | Painted splitters and pedestrian crossings adjacent to circulatory roadway on north and south legs. | 
| San Diego,
                CA San Diego Co. United States | Meade Ave. / Swift Ave. (32.75719, -117.11900) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 22.8600 | Other (At-Grade) Single-Lane | 2020 | Painted splitter islands on north and south legs. | 
| San Diego,
                CA San Diego Co. United States | Meade Ave. / 34th St. (32.75722, -117.12007) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 21.3360 | Other (At-Grade) Single-Lane | 2020 | Painted splitter islands on north and south legs. | 
| San Diego,
                CA San Diego Co. United States | Meade Ave. / Utah St. (32.75727, -117.13268) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 24.3840 | Other (At-Grade) Single-Lane | 2020 | Painted splitter islands and pedestrian crossings adjacent to circulatory roadway on north and south legs. | 
| San Diego,
                CA San Diego Co. United States | Wightman St. / 35th St. (32.74790, -117.11810) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 24.3840 | Other (At-Grade) Single-Lane | 2022 | Painted splitter island on north leg. | 
| Chico,
                CA Butte Co. United States | Memorial Way / Oleander Ave. (39.73345, -121.84053) | Roundabout Existing | All-Way Yield Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2024 | https://www.actionnewsnow.com/news/reducing-traffic-delays-in-chico/article_a82aa638-8bdb-11ef-9b56-1321e390d324.html | 
| (unincorporated),
                CA Plumas Co. United States | SR 36 / CR A13 (40.30580, -121.14170) | Roundabout Existing | All-Way Yield Unknown | 3 Approaches 0 Driveways 45.7200 | Other (At-Grade) Single-Lane | 2024 | South leg disconnected from existing TWSC intersection and shifted about 250 feet east along SR 36 to make two T-intersections. Roundabout designed for OSOW vehicles along SR 36. https://www.facebook.com/story.php?story_fbid=122177854508225216&id=61556756493806&_rdr | 
| Napa,
                CA Napa Co. United States | Soscol Ferry Rd. / SR 221 / SR 12 EB Ramps (38.24117, -122.26975) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 47.2440 | Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x1 max) | 2024 | https://dot.ca.gov/caltrans-near-me/district-4/d4-projects/soscol-junction | 
| Napa,
                CA Napa Co. United States | SR 221 (Napa Vallejo Hwy.) / SR 12 WB Entrance Ramp (38.24207, -122.26930) | Roundabout Existing | All-Way Yield None | 2 Approaches 0 Driveways 44.1960 | Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x1 max) | 2024 | https://dot.ca.gov/caltrans-near-me/district-4/d4-projects/soscol-junction | 
| American Canyon,
                CA Napa Co. United States | Devlin Rd. / Boone Dr. / (parking) (38.20182, -122.26679) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 42.6720 | Other (At-Grade) Single-Lane | 2022 | |
| Napa,
                CA Napa Co. United States | RiverSound Way / Kaiser Rd. (38.25745, -122.27725) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 39.6240 | Other (At-Grade) Single-Lane | 2024 | |
| Palm Desert,
                CA Riverside Co. United States | San Pablo Ave. / (unknown) (33.73244, -116.38242) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 32.9184 | Other (At-Grade) Single-Lane | 2022 | Class 2 bicycle lanes striped through roundabout without raised curbs. |