ZIP codes in Mendocino County
31 ZIPs touch Mendocino County, California. The blue dashed line is the county border; orange ZIPs reach into it.
31
ZIP codes
4
cross the county line
104,727
people in these ZIPs
58
counties in CA
Most people
Mendocino County ZIP list
More counties in California
- Lake County16
- Lassen County19
- Los Angeles County519
- Madera County19
- Marin County42
- Mariposa County13
- Merced County27
- Modoc County12
- Mono County9
- Monterey County38
- Napa County14
- Nevada County16
Questions people actually ask
How many ZIP codes are in Mendocino County, California?
31 ZIP codes reach into Mendocino County, including 2 PO Box or single-address ZIPs placed by the town they serve. 4 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Mendocino County has the most people?
95482 (Ukiah) has about 33,164 residents, the most of any ZIP touching Mendocino County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Mendocino 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 Mendocino 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