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ZIP codes in King County

123 ZIPs touch King County, Washington. The blue dashed line is the county border; orange ZIPs reach into it.

123

ZIP codes

8

cross the county line

2,329,437

people in these ZIPs

39

counties in WA

Most people

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King County ZIP list

More counties in Washington

All 39 counties in Washington

Questions people actually ask

How many ZIP codes are in King County, Washington?

123 ZIP codes reach into King County, including 34 PO Box or single-address ZIPs placed by the town they serve. 8 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in King County has the most people?

98052 (Redmond) has about 80,717 residents, the most of any ZIP touching King County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in King 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 King 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