ZIP codes in Gallatin County

9 ZIPs touch Gallatin County, Illinois. The blue dashed line is the county border; orange ZIPs reach into it.

ZIP codes

cross the county line

14,905

people in these ZIPs

102

counties in IL

Most people

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Gallatin County ZIP list

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Questions people actually ask

How many ZIP codes are in Gallatin County, Illinois?

9 ZIP codes reach into Gallatin County. 6 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Gallatin County has the most people?

62930 (Eldorado) has about 5,761 residents, the most of any ZIP touching Gallatin County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Gallatin 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 Gallatin 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