How many zip codes are in Solano County California?

Solano County, California contains 16 zip codes.

What is the county seat of Solano County?

The county seat of Solano County, California is Vallejo.

What cities are in Solano County?

Solano County USPS city names in this directory include Vallejo, Vacaville, Fairfield, Suisun City, Benicia, Dixon, Rio Vista, Travis Afb and 2 more. The county seat is Vallejo.

What is the population of Solano County?

The population of Solano County, California is approximately 449,823.

What zip codes are in Solano County?

Solano County contains 16 zip codes: 15 standard delivery ZIPs and 1 PO Box or unique ZIPs. Browse the table on this page for the complete list.

Solano County, California Zip Codes

📍 Solano County has 16 zip codes with a population of 449,823.

County

Solano

County Seat

Vallejo

Zip Codes

Population

449,823

Solano County is located in California with a land area of 796 square miles. The county seat is Vallejo. Below you'll find all 16 zip codes in Solano County with population, income and home value, the county's affordability profile, and links to its 10 city pages.

Population and demographic data sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code routing data sourced from the United States Postal Service (USPS).

All Solano County Zip Codes

ZIP Code	City	County	Population	Median Income	Median Home	Details
94510	Benicia	Solano	27,223	$124,099	$738,900	View →
94512	Birds Landing	Solano	57	—	—	View →
94533	Fairfield	Solano	78,129	$84,907	$462,500	View →
94534	Unincorporated	Solano	41,395	$132,382	$675,700	View →
94535	Travis Afb	Solano	3,873	$79,418	—	View →
94571	Rio Vista	Solano	10,514	$80,962	$454,900	View →
94585	Suisun City	Solano	29,401	$95,109	$486,500	View →
94589	Vallejo	Solano	29,959	$85,373	$448,100	View →
94590	Vallejo	Solano	37,991	$65,340	$469,600	View →
94591	Vallejo	Solano	59,026	$104,567	$574,000	View →
94592	Vallejo	Solano	1,020	$149,583	$675,100	View →
95620	Dixon	Solano	22,004	$94,042	$555,100	View →
95625	Elmira	Solano	88	—	—	View →
95687	Vacaville	Solano	68,996	$104,135	$540,800	View →
95688	Vacaville	Solano	40,147	$116,699	$638,100	View →
95696	Vacaville	PO Box ZIP	—	—	—	View →

Solano County at a Glance

Residents (ZIPs with data)

449,823

Median household income

$99,622

Median home value

$547,950

Price-to-income ratio

5.5

Median rent

$2,037

Owner-occupied

67%

Bachelor's degree+

27%

Poverty rate

8.6%

Solano County has 16 ZIP codes in this directory: 15 standard delivery ZIPs and 1 PO Box or unique ZIP that carries no resident population in Census data. The 12 ZIPs with published Census housing data cover 449,823 residents, the largest being 94533 (Fairfield) with 78,129 people.

The median ZIP in Solano County has a household income of $99,622 and a home value of $547,950, a price-to-income ratio of 5.5, below the 6.7 California ZIP median. Affordability ranges from 94592 in Vallejo at a ratio of 4.5 to 94510 in Benicia, where the median home is $738,900. The highest median income is in 94592 (Vallejo) at $149,583. Median rent across these ZIPs is $2,037 a month.

67% of households in the typical Solano County ZIP own their home (statewide ZIP median 64%). 27% of adults hold a bachelor's degree, below the 31% statewide median. The median poverty rate is 8.6%, below the 10.8% statewide ZIP median. Overall density is about 565 residents per square mile across 797 square miles of ZIP land area.

Medians are taken across the ZIP codes listed below (each ZIP weighted equally); PO Box and no-data ZIPs are excluded. Definitions on the methodology page; statewide comparisons in the 2026 California ZIP Code Affordability Report.