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ZIP codes in San Diego County

184 ZIPs touch San Diego County, California. The blue dashed line is the county border; orange ZIPs reach into it.

184

ZIP codes

4

cross the county line

3,387,293

people in these ZIPs

58

counties in CA

Most people

← All California ZIP codes

San Diego County ZIP list

More counties in California

All 58 counties in California

Questions people actually ask

How many ZIP codes are in San Diego County, California?

184 ZIP codes reach into San Diego County, including 68 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 San Diego County has the most people?

91911 (Chula Vista) has about 85,542 residents, the most of any ZIP touching San Diego County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in San Diego 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 San Diego 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