County
· Iowa
Plymouth County
Plymouth County is the westernmost county in the U.S. state of Iowa. As of the 2020 census, the population was 25,698, and was estimated to be 25,697 in 2025. The county seat and the largest city is Le Mars. Plymouth County was named after Plymouth, Massachusetts.
25,650 population
(2021)
·
County area: Plymouth
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Cities and towns 11
Reference data (Census of Governments 2022)
- Census ID (PID6)
- 126552
- FIPS state
- 19
- FIPS county
- 149
- FIPS place
- 99149
- Census record name
- COUNTY OF PLYMOUTH
- Mailing address
- 215 4TH AVE SE, LE MARS 51031