COUNTY · MA
Plymouth County, Massachusetts
Plymouth County is a county in Massachusetts with FIPS code 25023 and an estimated population of 535,308 (Census 2023), 7th largest of 14 in the state.
County facts
- Name
- Plymouth County
- State
- Massachusetts
- Type
- county
- FIPS code
- 25023
- State FIPS
- 25
- Population (2023)
- 535,308
- Change since 2020
- +1.0%
- State rank
- 7 of 14
Population is the Census Bureau’s Vintage 2023 estimate.
Other counties in Massachusetts
Questions
What is the FIPS code for Plymouth County?
Plymouth County, Massachusetts has the five-digit FIPS code 25023: 25 for the state and 023 for the county.
What state is Plymouth County in?
Plymouth County is in Massachusetts.
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.