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ZIP codes in Riverside County

105 ZIPs touch Riverside County, California. The blue dashed line is the county border; orange ZIPs reach into it.

105

ZIP codes

11

cross the county line

2,709,298

people in these ZIPs

58

counties in CA

Most people

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Riverside County ZIP list

More counties in California

All 58 counties in California

Questions people actually ask

How many ZIP codes are in Riverside County, California?

105 ZIP codes reach into Riverside County, including 29 PO Box or single-address ZIPs placed by the town they serve. 11 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Riverside County has the most people?

92503 (Riverside) has about 88,395 residents, the most of any ZIP touching Riverside County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Riverside 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 Riverside 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