ZIP codes in Lassen County
19 ZIPs touch Lassen County, California. The blue dashed line is the county border; orange ZIPs reach into it.
19
ZIP codes
5
cross the county line
33,987
people in these ZIPs
58
counties in CA
Most people
Lassen County ZIP list
More counties in California
- Humboldt County39
- Imperial County20
- Inyo County11
- Kern County69
- Kings County14
- Lake County16
- Los Angeles County519
- Madera County19
- Marin County42
- Mariposa County13
- Mendocino County31
- Merced County27
Questions people actually ask
How many ZIP codes are in Lassen County, California?
19 ZIP codes reach into Lassen 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 Lassen County has the most people?
96130 (Susanville) has about 20,173 residents, the most of any ZIP touching Lassen County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Lassen 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 Lassen 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