ZIP codes

ZIP codes in Solano County, California

Solano County has 21 ZIP codes. 12 lie entirely inside it and 9 are shared with neighboring counties, so part of their land and their people are elsewhere. About 451,385 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 21; With 1% or more of their land inside
Entirely inside: 12; 99% or more of their land
Shared with other counties: 9; Most with Yolo County (5)
Most populated ZIP: 94533; 78,805 people · Fairfield
Least populated ZIP: 94512; 130 people
Largest ZIP by land: 95620; 241 sq mi · Dixon

Map of the ZIP codes in Solano 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 Solano County

21 ZIP codes in Solano County, CA, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
94503	American Canyon	21,841	34%	≈ 2,808
94510	Benicia	26,749	100%	26,749
94512	—	130	100%	130
94533	Fairfield	78,805	100%	78,805
94534	Fairfield	41,203	100%	41,203
94535	Fairfield	3,952	100%	3,952
94571	Rio Vista	10,974	82%	≈ 9,217
94585	Suisun City	29,357	100%	29,357
94589	Vallejo	29,990	100%	29,990
94590	Vallejo	37,128	100%	37,128
94591	Vallejo	58,193	97%	≈ 58,075
94592	Vallejo	1,049	100%	1,049
95612	Clarksburg	1,865	11%	≈ 152
95616	Davis	53,630	3.2%	≈ 21
95618	Davis	26,267	23%	≈ 192
95620	Dixon	22,223	76%	≈ 20,415
95625	Elmira	319	100%	319
95687	Vacaville	69,390	100%	69,390
95688	Vacaville	40,201	100%	40,201
95690	Walnut Grove	2,431	36%	≈ 979
95694	Winters	10,759	20%	≈ 1,253

ZIP codes shared with other counties

These 9 ZIP codes have part of their land in another county. The first figure is the share of their land in Solano County; then, where the rest lies.

94503 (American Canyon): 34% here; 66% in Napa County.
94571 (Rio Vista): 82% here; 18% in Sacramento County.
94591 (Vallejo): 97% here; 3.0% in Napa County.
95612 (Clarksburg): 11% here; 89% in Yolo County.
95616 (Davis): 3.2% here; 97% in Yolo County.
95618 (Davis): 23% here; 77% in Yolo County.
95620 (Dixon): 76% here; 24% in Yolo County.
95690 (Walnut Grove): 36% here; 64% in Sacramento County.
95694 (Winters): 20% here; 80% in Yolo 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 Vallejo (4), Fairfield (3), Davis (2), Vacaville (2), American Canyon (1), and Benicia (1); 13 places in all.

They start with 2 different three-digit prefixes, one per USPS sorting center: 945 and 956.

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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