COUNTY · IA
Polk County, Iowa
Polk County is a county in Iowa with FIPS code 19153 and an estimated population of 505,255 (Census 2023), 1st largest of 99 in the state.
County facts
- Name
- Polk County
- State
- Iowa
- Type
- county
- FIPS code
- 19153
- State FIPS
- 19
- Population (2023)
- 505,255
- Change since 2020
- +2.5%
- State rank
- 1 of 99
Population is the Census Bureau’s Vintage 2023 estimate.
Major cities in Polk County
Other counties in Iowa
Questions
What is the FIPS code for Polk County?
Polk County, Iowa has the five-digit FIPS code 19153: 19 for the state and 153 for the county.
What state is Polk County in?
Polk 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.