District/County Map
Use the map or the table below to determine the abbreviation for a particular county, or which Caltrans district a county is in.
| COUNTY | DISTRICT | ABBREV. |
|---|---|---|
| Alameda | 4 | ALA |
| Alpine | 10 | ALP |
| Amador | 10 | AMA |
| Butte | 3 | BUT |
| Calaveras | 10 | CAL |
| Colusa | 3 | COL |
| Contra Costa | 4 | CC |
| Del Norte | 1 | DN |
| El Dorado | 3 | ED |
| Fresno | 6 | FRE |
| Glenn | 3 | GLE |
| Humboldt | 1 | HUM |
| Imperial | 11 | IMP |
| Inyo | 9 | INY |
| Kern | 6 | KER |
| Kings | 6 | KIN |
| Lake | 1 | LAK |
| Lassen | 2 | LAS |
| Los Angeles | 7 | LA |
| Madera | 6 | MAD |
| Marin | 4 | MRN |
| Mariposa | 10 | MPA |
| Mendocino | 1 | MEN |
| Merced | 10 | MER |
| Modoc | 2 | MOD |
| Mono | 9 | MNO |
| Monterey | 5 | MON |
| Napa | 4 | NAP |
| Nevada | 3 | NEV |
| Orange | 12 | ORA |
| Placer | 3 | PLA |
| Plumas | 2 | PLU |
| Riverside | 8 | RIV |
| Sacramento | 3 | SAC |
| San Benito | 5 | SBT |
| San Bernardino | 8 | SBD |
| San Diego | 11 | SD |
| San Francisco | 4 | SF |
| San Joaquin | 10 | SJ |
| San Luis Obispo | 5 | SLO |
| San Mateo | 4 | SM |
| Santa Barbara | 5 | SB |
| Santa Clara | 4 | SCL |
| Santa Cruz | 5 | SCR |
| Shasta | 2 | SHA |
| Sierra | 3 | SIE |
| Siskiyou | 2 | SIS |
| Solano | 4 | SOL |
| Sonoma | 4 | SON |
| Stanislaus | 10 | STA |
| Sutter | 3 | SUT |
| Tehama | 2 | TEH |
| Trinity | 2 | TRI |
| Tulare | 6 | TUL |
| Tuolumne | 10 | TUO |
| Ventura | 7 | VEN |
| Yolo | 3 | YOL |
| Yuba | 3 | YUB |