| ZIP Codes: | 16 ZIP Codes (14 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 369 / 530 / 707 |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 2:11:30 PM |
| Population: | 449,663 [See All] |
| FIPS: | 06095 |
| CBSA: | Vallejo, CA |
| Land Area: | 864 sq mi |
| Water Area: | 30 sq mi |
| Coordinates: | 38.2307, -122.0162 |
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449,663 residents live across 16 ZIPs covering 864 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 420,438 to 449,663 from 2014 to 2024 — a +7.0% change. 11 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 94534 (Fairfield, $140,198 median) and poorest ZIP 94590 (Vallejo, $65,290) are 11.1 miles apart — a 2.1× income gap across local geography.
Median home values vary 1.7× across this county — from $490,200 in 94571 (Rio Vista) to $810,000 in 94510 (Benicia).
Density varies 87× across the county — from 61 people/sq mi in 94592 (Vallejo) to 5,327 in 94590 (Vallejo).
Educational attainment ranges from 19.7% bachelor's+ in 94533 (Fairfield) to 47.6% in 94510 (Benicia) — the breadth of educational profiles across the area.
Within California, this is the #19 most populous of 58 counties and ranks #21 for median household income with the #14 fastest decade growth .
Weighted by population, the typical household earns about $102,468 across the county — reflecting what a typical resident sees, not a simple ZIP average.
28.7% of adults age 25+ hold a bachelor's degree or higher (90,235 of 314,246 reporting).
14 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 94533 | Fairfield | Standard | 78,805 | $87,384 | 22.3 | 11.6% |
| 95687 | Vacaville | Standard | 69,390 | $109,566 | 39.7 | 5.5% |
| 94591 | Vallejo | Standard | 58,193 | $104,550 | 23.5 | 6.7% |
| 94534 | Fairfield | Standard | 41,203 | $140,198 | 80.4 | 12.9% |
| 95688 | Vacaville | Standard | 40,201 | $118,186 | 92.9 | 12.2% |
| 94590 | Vallejo | Standard | 37,128 | $65,290 | 7.0 | 6.5% |
| 94589 | Vallejo | Standard | 29,990 | $92,735 | 7.6 | -2.7% |
| 94585 | Suisun City | Standard | 29,357 | $94,740 | 127.6 | 0.5% |
| 94510 | Benicia | Standard | 26,749 | $121,204 | 32.1 | -2.8% |
| 95620 | Dixon | Standard | 22,223 | $103,054 | 242.6 | 5.8% |
| 94571 | Rio Vista | Standard | 10,974 | $87,740 | 114.6 | 34.3% |
| 94535 | Travis Afb | Standard | 3,952 | $83,879 | 14.5 | -13.0% |
| 94592 | Vallejo | Standard | 1,049 | $115,536 | 17.1 | 61.1% |
| 95625 | Elmira | PO Box | 319 | $86,349 | 0.8 | 59.5% |
| 94512 | Birds Landing | Standard | 130 | — | 41.5 | -39.3% |
| 95696 | Vacaville | PO Box | — | — | 0.0 | — |