County research and study
Massachusetts county reference
14 counties and county equivalents in Massachusetts. Search names or FIPS codes, compare Census geography and keep the original sources with your work.
- Barnstable County
Massachusetts · FIPS 25001
233,539 residents · 2025 estimate
- Berkshire County
Massachusetts · FIPS 25003
128,224 residents · 2025 estimate
- Bristol County
Massachusetts · FIPS 25005
593,640 residents · 2025 estimate
- Dukes County
Massachusetts · FIPS 25007
21,219 residents · 2025 estimate
- Essex County
Massachusetts · FIPS 25009
826,653 residents · 2025 estimate
- Franklin County
Massachusetts · FIPS 25011
70,698 residents · 2025 estimate
- Hampden County
Massachusetts · FIPS 25013
464,338 residents · 2025 estimate
- Hampshire County
Massachusetts · FIPS 25015
164,065 residents · 2025 estimate
- Middlesex County
Massachusetts · FIPS 25017
1,669,979 residents · 2025 estimate
- Nantucket County
Massachusetts · FIPS 25019
14,758 residents · 2025 estimate
- Norfolk County
Massachusetts · FIPS 25021
739,749 residents · 2025 estimate
- Plymouth County
Massachusetts · FIPS 25023
546,829 residents · 2025 estimate
- Suffolk County
Massachusetts · FIPS 25025
791,891 residents · 2025 estimate
- Worcester County
Massachusetts · FIPS 25027
888,502 residents · 2025 estimate
Use the county data
Use a county profile as a source-reading exercise or the geographic context for your own research. Keep the county FIPS identifier with your notes so that similarly named places in different states are not mixed.
The figures describe the county; they are not an evaluation of schools or an estimate of educational outcomes.
Geography: 2025 U.S. Census Gazetteer. Population: Vintage 2025 estimates, July 1, 2025. County equivalents include parishes, boroughs, independent cities and planning regions. Puerto Rico population is not supplied by this population file.