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| District | Counties | ||
|---|---|---|---|
| HQ | Caltrans HQ |  |
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| 1 | Del Norte, Humboldt, Lake, Mendocino |   |
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| 2 | Lassen, Modoc, Plumas, Shasta, Siskiyou, Tehama, Trinity | |
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| 3 | Butte, Colusa,
El Dorado, Glenn, Nevada, Placer, Sacramento, Sierra, Sutter, Yolo, Yuba |
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| 4 | Alameda, Contra
Costa, Napa, Marin, San Francisco, San Mateo, Santa Clara, Solano, Sonoma |
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| 5 | Monterey, San Benito, San Luis Obispo, Santa Barbara, Santa Cruz | |
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| 6 | Fresno, Kern, Kings, Madera, Tulare | |
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| 7 | Los Angeles, Ventura | |
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| 8 | Riverside, San Bernardino |  |
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| 9 | Inyo, Mono | |
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| 10 | Alpine, Amador,
Calaveras, Mariposa, Merced, San Joaquin, Stanislaus, Tuolumne |
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| 11 | Imperial, San Diego | |
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| 12 | Orange | |
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| Bay Bridge | Bay Bridge Social Media Information | |
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| Rail | Rail Social Media Information | |