
Plymouth
- County:
- Marshall County
- County Seat:
- Yes
- Area (mi²):
- 7.571
- State:
- Indiana
Plymouth is a city located in Marshall County, Indiana. Plymouth has a 2025 population of 11,507. It is also the county seat of .Plymouth is currently growing at a rate of 2.3% annually and its population has increased by 12.68% since the most recent census, which recorded a population of 10,212 in 2020.
The average household income in Plymouth is $69,851 with a poverty rate of 14.98%. The median age in Plymouth is 34.9 years: 30.4 years for males, and 39.3 years for females.