COUNTY · IA
Plymouth County, Iowa
Plymouth County is a county in Iowa with FIPS code 19149 and an estimated population of 25,722 (Census 2023), 25th largest of 99 in the state.
County facts
- Name
- Plymouth County
- State
- Iowa
- Type
- county
- FIPS code
- 19149
- State FIPS
- 19
- Population (2023)
- 25,722
- Change since 2020
- +0.1%
- State rank
- 25 of 99
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Plymouth County?
Plymouth County, Iowa has the five-digit FIPS code 19149: 19 for the state and 149 for the county.
What state is Plymouth County in?
Plymouth 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.