COUNTY · IA
Buchanan County, Iowa
Buchanan County is a county in Iowa with FIPS code 19019 and an estimated population of 20,691 (Census 2023), 30th largest of 99 in the state.
County facts
- Name
- Buchanan County
- State
- Iowa
- Type
- county
- FIPS code
- 19019
- State FIPS
- 19
- Population (2023)
- 20,691
- Change since 2020
- +0.4%
- State rank
- 30 of 99
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Buchanan County?
Buchanan County, Iowa has the five-digit FIPS code 19019: 19 for the state and 019 for the county.
What state is Buchanan County in?
Buchanan County is in Iowa.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.