| ZIP Codes: | 12 ZIP Codes (9 Standard, 3 PO Box, 0 Unique) [See All] |
| Area Codes: | 369 / 707 |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 2:11:29 PM |
| Population: | 135,313 [See All] |
| FIPS: | 06055 |
| CBSA: | Napa, CA |
| Land Area: | 848 sq mi |
| Water Area: | 38 sq mi |
| Coordinates: | 38.4602, -122.3827 |
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135,313 residents live across 12 ZIPs covering 848 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 140,023 to 135,313 from 2014 to 2024 — a -3.4% change. 4 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 94574 (Saint Helena, $139,474 median) and poorest ZIP 94599 (Yountville, $80,372) are 10.3 miles apart — a 1.7× income gap across local geography.
Median home values vary 2.3× across this county — from $697,400 in 94503 (American Canyon) to $1,637,800 in 94574 (Saint Helena).
Density varies 35× across the county — from 57 people/sq mi in 94574 (Saint Helena) to 1,965 in 94599 (Yountville).
Educational attainment ranges from 32.4% bachelor's+ in 94503 (American Canyon) to 55.2% in 94574 (Saint Helena) — the breadth of educational profiles across the area.
Within California, this is the #34 most populous of 58 counties and ranks #8 for median household income .
On the national stage, Napa County is ranks #67 for income .
Weighted by population, the typical household earns about $112,597 across the county — reflecting what a typical resident sees, not a simple ZIP average.
39.8% of adults age 25+ hold a bachelor's degree or higher (38,939 of 97,861 reporting).
9 Standard delivery, 3 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 94558 | Napa | Standard | 63,657 | $113,269 | 444.1 | -6.3% |
| 94559 | Napa | Standard | 27,714 | $105,188 | 48.1 | 2.4% |
| 94503 | American Canyon | Standard | 21,841 | $121,088 | 30.5 | 8.6% |
| 94574 | Saint Helena | Standard | 7,457 | $139,474 | 131.2 | -19.8% |
| 94515 | Calistoga | Standard | 6,946 | $94,464 | 109.2 | -5.0% |
| 94508 | Angwin | Standard | 3,495 | $116,667 | 16.2 | -15.1% |
| 94599 | Yountville | Standard | 3,348 | $80,372 | 1.7 | 5.1% |
| 94567 | Pope Valley | Standard | 668 | $80,833 | 66.2 | -8.5% |
| 94576 | Deer Park | Standard | 103 | $170,677 | 0.2 | 18.4% |
| 94573 | Rutherford | PO Box | 84 | $250,001 | 0.4 | -40.8% |
| 94562 | Oakville | PO Box | 0 | — | 0.1 | — |
| 94581 | Napa | PO Box | — | — | 0.0 | — |