ZIP codes in Napa County
14 ZIPs touch Napa County, California. The blue dashed line is the county border; orange ZIPs reach into it.
14
ZIP codes
5
cross the county line
228,702
people in these ZIPs
58
counties in CA
Most people
Napa County ZIP list
More counties in California
- Mariposa County13
- Mendocino County31
- Merced County27
- Modoc County12
- Mono County9
- Monterey County38
- Nevada County16
- Orange County149
- Placer County35
- Plumas County19
- Riverside County105
- Sacramento County135
Questions people actually ask
How many ZIP codes are in Napa County, California?
14 ZIP codes reach into Napa County, including 1 PO Box or single-address ZIPs placed by the town they serve. 5 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Napa County has the most people?
94558 (Napa) has about 63,657 residents, the most of any ZIP touching Napa County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Napa County and another county?
Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Napa County. For one address, pin the exact spot on the ZIP finder to see its county.
Where does this list come from?
ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.
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Updated 2026-11-10 · Where the data comes from