ZIP codes in Buchanan County

16 ZIPs touch Buchanan County, Iowa. The blue dashed line is the county border; orange ZIPs reach into it.

ZIP codes

cross the county line

33,533

people in these ZIPs

counties in IA

Most people

← All Iowa ZIP codes

Buchanan County ZIP list

More counties in Iowa

All 99 counties in Iowa

Questions people actually ask

How many ZIP codes are in Buchanan County, Iowa?

16 ZIP codes reach into Buchanan County. 11 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Buchanan County has the most people?

50644 (Independence) has about 8,419 residents, the most of any ZIP touching Buchanan County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Buchanan 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 Buchanan 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.

Keep exploring

My ZIP codeYour ZIP, lit up on the map, with the numbers behind it.Open What county am I inYour county, lit up with its border and how far the county line is.Open What time zone am I inYour zone, UTC offset and daylight saving, plus every US zone at a glance.Open ZIP code mapEvery US ZIP code with its boundary. Hover, tap, color by data.Open Radius mapDrag a circle and watch every ZIP inside light up. Copy or export.Open ZIP GuessrFive ZIPs a day. Tap where each one is, keep your streak, share your score.Open ZIP codes near meEvery ZIP around you, nearest first, with distance and direction.Open ZIP distanceMiles between two ZIP codes, drawn as a flight path.Open

Updated 2026-11-10 · Where the data comes from