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ZIP codes in Union County

9 ZIPs touch Union County, South Carolina. The blue dashed line is the county border; orange ZIPs reach into it.

9

ZIP codes

5

cross the county line

42,071

people in these ZIPs

46

counties in SC

Most people

← All South Carolina ZIP codes

Union County ZIP list

More counties in South Carolina

All 46 counties in South Carolina

Questions people actually ask

How many ZIP codes are in Union County, South Carolina?

9 ZIP codes reach into Union County. 5 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Union County has the most people?

29379 (Union) has about 17,607 residents, the most of any ZIP touching Union County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Union 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 Union 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