Boundary Atlas

ZIP code 95023: Hollister, CA

ZIP code 95023 is in Hollister (73% of residents) and Ridgemark (5.6%), in San Benito County (100%) and Santa Clara County (0.3%), California. 21% of its residents live outside city limits. It is in California's 18th congressional district. Its state senate districts are State Senate District 17 (100%) and State Senate District 15 (0.3%); its state house districts are Assembly District 29 (100%) and Assembly District 25 (0.3%).

56,973residents (2020 Census)
394.8 sq miland area
3cities and towns
1congressional district
33voting precincts

See it on the mapAll of California

City and county

City or townShare of ZIP residents
Hollister73%
Ridgemark5.6%
Tres Pinos0.2%

CountyShare of ZIP residents
San Benito County100%
Santa Clara County0.3%

Town or county subdivisionShare of ZIP residents
Hollister CCD98%
San Juan Bautista CCD1.3%
Diablo Range CCD0.3%
San Benito-Bitterwater CCD<0.1%

Congressional district

Congressional districtShare of ZIP residents
California's 18th congressional district (CA-18)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 17100%
State Senate District 150.3%

State house districtShare of ZIP residents
Assembly District 29100%
Assembly District 250.3%

Voting precincts

33 voting precincts overlap ZIP 95023. Map them, with each precinct's share of the ZIP's residents.

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Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:

related_geographies(id="us:zcta:95023")

ZIP 95023 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.