California's 18th congressional district (CA-18)
California's 18th congressional district (CA-18) covers parts or all of San Benito County, Monterey County, Santa Cruz County, Santa Clara County, Kings County and Fresno County, and 50 ZIP codes (20 wholly inside it). Its 2020 population was 770,826. This is the map in force for the November 3, 2026 election.
Who represents CA-18
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (CA-18) | Zoe Lofgren (D) | 202-225-3072 |
| U.S. Senator | Adam B. Schiff (D) | 202-224-3841 |
| U.S. Senator | Alex Padilla (D) | 202-224-3553 · contact form |
Elected in 2024 under CA's previous congressional map; this district's lines changed for the 120th Congress (seated January 3, 2027).
Officials serving now (members of Congress until January 3, 2027). Sources: Members of Congress: the @unitedstates project, congress-legislators (CC0).
Counties
| County | Share of the county's residents in CA-18 |
|---|---|
| San Benito County | 100% |
| Monterey County | 62% |
| Santa Cruz County | 25% |
| Santa Clara County | 17% |
| Kings County | 9.0% |
| Fresno County | 1.8% |
ZIP codes
Percentages mark ZIPs only partly in CA-18: the share of that ZIP's residents inside it.
- 93204
- 93210 (99%)
- 93239 (1.2%)
- 93426 (63%)
- 93450
- 93451 (12%)
- 93622 (0.9%)
- 93640 (<0.1%)
- 93901 (100%)
- 93905
- 93906
- 93907 (43%)
- 93908 (15%)
- 93924 (1.4%)
- 93925
- 93926
- 93927
- 93928
- 93930
- 93932
- 93954
- 93960
- 94550 (0.2%)
- 95004
- 95012 (73%)
- 95013 (11%)
- 95019
- 95020 (98%)
- 95023
- 95035 (<0.1%)
- 95037 (91%)
- 95043
- 95045
- 95046 (98%)
- 95075
- 95076 (85%)
- 95110 (80%)
- 95112 (84%)
- 95113
- 95116 (100%)
- 95122 (24%)
- 95125 (31%)
- 95126 (8.2%)
- 95127 (87%)
- 95132 (0.2%)
- 95133 (4.4%)
- 95135 (0.6%)
- 95138 (0.5%)
- 95140
- 95148 (8.1%)
Towns
Avenal CCD, Gonzales CCD, Greenfield CCD, Hollister CCD, King City CCD, San Benito-Bitterwater CCD, San Juan Bautista CCD, Soledad CCD, South Santa Clara Valley CCD, Coalinga CCD, Salinas CCD, San Ardo CCD, Watsonville CCD, Pajaro CCD, Diablo Range CCD, Castroville CCD, Llagas-Uvas CCD, San Jose CCD, Huron CCD, Toro Park CCD, Big Sur CCD, Mendota CCD and Firebaugh CCD.
Get this in your AI agent
Your agent can draw every precinct in CA-18, or list them with population shares (related_geographies). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
get_boundaries(id="us:congressional_district:0618", children_level="precinct", include_districts=True)