Massachusetts County Maps
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Massachusetts has 14 counties, a population of more than 7 million people, about 539 zip codes and 217 public school districts. Those counties vary widely in population, school enrollment, zip code coverage and local boundary structure. Middlesex County has the largest population in the state, while Nantucket County has the smallest. Browse the map, population, zip codes, school districts, subdivisions and county list sections below to explore further. Or, simply start typing in the box below to go directly to that county.
Interactive Massachusetts County Map
This Massachusetts county map preview highlights population-by-county context, ZIP code coverage, school districts, and local boundary structure. Full statewide and county-level data packages are available when you need complete downloadable datasets. Click or tap any county to view its maps, trends and data.
Start with a free preview, or go straight to the full Massachusetts dataset .
Massachusetts Population By County
Massachusetts's population was over 7 million in 2020, up 482,288 (7.37%) residents from 2010. Middlesex County had the largest population in the state with more than 2 million people. Worcester and Essex Counties also stand out as major population centers. Nantucket County was the least populated area in Massachusetts with only 14,255 residents. The table below compares Massachusetts county populations and recent population trends.
The Most Populated Counties In Massachusetts
| County | Population | Trend (2010-2020) |
|---|---|---|
| Middlesex County | 1,632,002 | ▴ 8.58% |
| Worcester County | 862,111 | ▴ 7.96% |
| Essex County | 809,829 | ▴ 8.97% |
| Suffolk County | 797,936 | ▴ 10.51% |
| Norfolk County | 725,981 | ▴ 8.22% |
| Download all county population data | ||
County populations reflect the latest state serving context (2020).
Massachusetts County Map With ZIP Codes
Massachusetts has about 539 zip codes statewide. Worcester County contains the most zip codes, with 85. County-level zip code maps give a faster and clearer way to understand local coverage as zip boundaries can span county and municipal lines. The maps below highlight a few Massachusetts counties.
Massachusetts School Districts By County
Massachusetts has 217 public school districts with 797,016 students enrolled as of 2024. Middlesex County stands out for both district count and total enrollment. Bristol County posted the largest recent enrollment gain. The table below compares county level school district totals and recent enrollment trends across the state.
Largest School Districts in Massachusetts
| County | Districts | Enrollment | Trend |
|---|---|---|---|
| Middlesex County | 44 | 191,971 | ▴ 0.27% |
| Worcester County | 37 | 108,254 | ▴ 0.47% |
| Essex County | 24 | 98,068 | ▴ 0.21% |
| Norfolk County | 24 | 85,954 | ▴ 0.10% |
| Plymouth County | 20 | 68,425 | ▾ 0.42% |
| Download all school district data | |||
School district enrollment and trend values reflect the most recent state-level context (2024).
Massachusetts County Map With Subdivisions
Massachusetts has about 357 local subdivisions statewide. These boundaries add another layer of detail within counties and help show how local subdivision lines fit inside county boundaries. The previews below highlight a few Massachusetts counties with subdivision map coverage.
Get the Full Massachusetts Data Package
The sections above provide a preview of Massachusetts county maps and county-level data. The full package includes complete statewide coverage with ready-to-use files for mapping, planning, and analysis.
Everything is organized to save hours of data collection, cleanup, and integration work.
- County map exports and boundary coverage for every county in Massachusetts
- Statewide GIS layers for ZIP codes, subdivisions, school districts, roads, water, and political boundaries
- Population, demographics, school, housing, and trend context aligned across counties
- Database files, map-ready exports, and documentation designed for faster research workflows
Includes GIS layers, maps, demographics, analytics, database files and planning tools.