ZIP codes

ZIP codes in Napa County, California

Napa County has 13 ZIP codes. 8 lie entirely inside it and 5 are shared with neighboring counties, so part of their land and their people are elsewhere. About 131,348 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 13; With 1% or more of their land inside
Entirely inside: 8; 99% or more of their land
Shared with other counties: 5; Most with Sonoma County (3)
Most populated ZIP: 94558; 63,657 people · Napa
Least populated ZIP: 94573; 84 people · Rutherford; 1 more with nobody living there
Largest ZIP by land: 94558; 402 sq mi · Napa

Map of the ZIP codes in Napa County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Napa County

13 ZIP codes in Napa County, CA, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
94503	American Canyon	21,841	66%	≈ 19,033
94508	Angwin	3,495	100%	3,495
94515	Calistoga	6,946	49%	≈ 5,751
94558	Napa	63,657	100%	63,657
94559	Napa	27,714	100%	27,714
94562	Oakville	0	100%	0
94567	—	668	100%	668
94573	Rutherford	84	100%	84
94574	St. Helena	7,457	99%	≈ 7,303
94576	Deer Park	103	100%	103
94591	Vallejo	58,193	3.0%	≈ 118
94599	Yountville	3,348	100%	3,348
95476	Sonoma	35,196	2.2%	≈ 74

ZIP codes shared with other counties

These 5 ZIP codes have part of their land in another county. The first figure is the share of their land in Napa County; then, where the rest lies.

94503 (American Canyon): 66% here; 34% in Solano County.
94515 (Calistoga): 49% here; 51% in Sonoma County.
94574 (St. Helena): 99% here; 1.3% in Sonoma County.
94591 (Vallejo): 3.0% here; 97% in Solano County.
95476 (Sonoma): 2.2% here; 98% in Sonoma County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Napa (2), American Canyon (1), Angwin (1), Calistoga (1), Deer Park (1), and Oakville (1); 11 places in all.

They start with 2 different three-digit prefixes, one per USPS sorting center: 945 and 954.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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