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ZIP codes in Brown County

20 ZIPs touch Brown County, Ohio. The blue dashed line is the county border; orange ZIPs reach into it.

20

ZIP codes

15

cross the county line

111,364

people in these ZIPs

88

counties in OH

Most people

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Brown County ZIP list

More counties in Ohio

All 88 counties in Ohio

Questions people actually ask

How many ZIP codes are in Brown County, Ohio?

20 ZIP codes reach into Brown County. 15 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Brown County has the most people?

45133 (Hillsboro) has about 23,443 residents, the most of any ZIP touching Brown County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Brown 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 Brown 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