COUNTY · WI
Iron County, Wisconsin
Iron County is a county in Wisconsin with FIPS code 55051 and an estimated population of 6,228 (Census 2023), 70th largest of 72 in the state.
County facts
- Name
- Iron County
- State
- Wisconsin
- Type
- county
- FIPS code
- 55051
- State FIPS
- 55
- Population (2023)
- 6,228
- Change since 2020
- +1.4%
- State rank
- 70 of 72
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Iron County?
Iron County, Wisconsin has the five-digit FIPS code 55051: 55 for the state and 051 for the county.
What state is Iron County in?
Iron County is in Wisconsin.
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.