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ZIP codes in Fairfax County

85 ZIPs touch Fairfax County, Virginia. The blue dashed line is the county border; orange ZIPs reach into it.

85

ZIP codes

16

cross the county line

1,339,570

people in these ZIPs

133

counties in VA

Most people

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Fairfax County ZIP list

More counties in Virginia

All 133 counties in Virginia

Questions people actually ask

How many ZIP codes are in Fairfax County, Virginia?

85 ZIP codes reach into Fairfax County, including 36 PO Box or single-address ZIPs placed by the town they serve. 16 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Fairfax County has the most people?

22030 (Fairfax) has about 61,332 residents, the most of any ZIP touching Fairfax County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Fairfax 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 Fairfax 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