County ZIP codes · California · FIPS 06055
Napa County, CA ZIP Codes
Napa County, California has 14 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 13 residential and 1 for PO boxes or a single organization. 10 of the residential ones lie mainly in Napa County and 3 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $80,372 in 94599 (Yountville) to $139,474 in 94574 (Saint Helena) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Napa County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $104,550 and $116,667.
They carry 12 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 13 residential ZIP codes in Napa County
10 ZIP codes lie mainly in Napa County; 3 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 94558 | Napa | 63,657 | 158 | $113k | $891k | 100% |
| 94559 | Napa | 27,714 | 666 | $105k | $899k | 100% |
| 94503 | American Canyon | 21,841 | 808 | $121k | $697k | 66% |
| 94574 | Saint Helena | 7,457 | 60 | $140k | $1.64M | 99% |
| 94508 | Angwin | 3,495 | 218 | $117k | $776k | 100% |
| 94599 | Yountville | 3,348 | 422 | $80k | $809k | 100% |
| 94567 | Pope Valley | 668 | 9 | $81k | $471k | 100% |
| 94576 | Deer Park | 103 | 363 | $171k | $986k | 100% |
| 94573 | Rutherford | 84 | 55 | $250k+ | – | 100% |
| 94562 | Oakville | no residents | 0 | – | – | 100% |
Partly in Napa County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
5 ZIP codes of Napa County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Napa | Elsewhere |
|---|---|---|
| 94591 | 3% | Solano County 97% |
| 95476 | 2% | Sonoma County 98% |
| 94503 | 66% | Solano County 34% |
| 94574 | 99% | Sonoma County 1% |
| 94515 | 49% | Sonoma County 51% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 94581 | Napa |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Napa County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Napa County's ZIP codes use 2 prefixes: 945 and 954.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.