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Northeast county atlas

Massachusetts county map

Explore all 14 counties. Select a county to see its map, or download a copy for your next project.

2025 Census boundaries14 mapped unitsCapital: Boston
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Boundary map 100%
Labelled map of Massachusetts counties Barnstable CountyBerkshire CountyBristol CountyDukes CountyEssex CountyFranklin CountyHampden CountyHampshire CountyMiddlesex CountyNantucket CountyNorfolk CountyPlymouth CountySuffolk CountyWorcester County
Select a county to highlight its boundary.
2025 U.S. Census boundaries. Zoom to reveal more names. Drag to pan when zoomed; use arrow keys, + and − with the map focused.

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Choose a format for printing, editing, or sharing. All downloads are free.

SVG

SVG is editable vector artwork. PNG is a high-resolution image. PDF uses landscape Letter pages, with a separate key when needed.

Downloads contain the complete boundary map, independent of zoom. Crowded names use a numbered key. Numbered quiz maps use the county list / answer key (CSV). Boundary data (GeoJSON) · Reuse with source credit.

Roads, terrain & aerial imagery

Explore Massachusetts with a county boundary overlay. Choose a view to load the interactive map.

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Street names, terrain, or aerial photography with the county boundary in view.

Backgrounds load from OpenStreetMap or USGS only when selected. Imagery dates and detail vary by location.

Map scope: Use the boundary map for names and shapes, or the interactive background viewer for roads, terrain, and aerial imagery. County boundaries do not identify parcels or ZIP codes.

Massachusetts county geography overview

Massachusetts has 14 counties, which places it 44th among the 50 state and District of Columbia maps in this atlas when ordered by number of county-level units. Their combined 7,801 square miles of land place the state 45th by mapped land area.

The average county-level area is 557 square miles, while the median is 540 square miles. The median is often the better description of a typical unit because one or two very large areas can pull the average upward. The five largest units together account for about 59% of the state’s mapped land area.

14county-level units
540 sq mimedian land area
1,510.7 sq milargest unit
26%share of mapped area that is water

Largest and smallest Massachusetts counties

Worcester County is the largest county-level unit by land area at 1,510.7 square miles. It represents about 19% of all mapped land in Massachusetts. At the other end of the range, Nantucket County has 46.2 square miles of land.

Largest by land area

  1. Worcester County1,510.7 sq mi
  2. Berkshire County926.9 sq mi
  3. Middlesex County817.9 sq mi
  4. Franklin County699.2 sq mi
  5. Plymouth County658.5 sq mi

Smallest by land area

  1. Nantucket County46.2 sq mi
  2. Suffolk County58.3 sq mi
  3. Dukes County103.2 sq mi
  4. Barnstable County394.2 sq mi
  5. Norfolk County396.1 sq mi

Rankings use land area rather than total area. This avoids making coastal or lake counties appear larger solely because their boundaries include extensive water.

Alphabetical list of Massachusetts counties

The table is alphabetical, so it works as a name and FIPS-code reference rather than an area ranking. Every identifier begins with the Massachusetts state FIPS prefix 25. Land and water figures are rounded to one decimal place.

14 county-level areas

Download county data / numbered map key (CSV)
No.NameFIPS codeLand areaWater area
1Barnstable County25001394.2 sq mi911.4 sq mi
2Berkshire County25003926.9 sq mi19.6 sq mi
3Bristol County25005553.1 sq mi138 sq mi
4Dukes County25007103.2 sq mi387.8 sq mi
5Essex County25009492.5 sq mi336 sq mi
6Franklin County25011699.2 sq mi25.3 sq mi
7Hampden County25013617 sq mi17.1 sq mi
8Hampshire County25015527.2 sq mi18 sq mi
9Middlesex County25017817.9 sq mi29 sq mi
10Nantucket County2501946.2 sq mi257.5 sq mi
11Norfolk County25021396.1 sq mi48.2 sq mi
12Plymouth County25023658.5 sq mi434.8 sq mi
13Suffolk County2502558.3 sq mi62 sq mi
14Worcester County250271,510.7 sq mi68.5 sq mi

How to read and use this map

County lines are administrative boundaries, not postal routes. A mailing address can use a city name associated with a neighboring area, and ZIP codes can cross county lines. When you need to identify a county for an address, confirm it with an official geocoder or local government source.

For classroom or planning use, download a PDF from the controls above. Labelled exports use numbered callouts for crowded areas; numbered quiz maps match the alphabetical county list. SVG files keep the boundary lines sharp at larger paper sizes.

Interpreting the water figure: About 26% of the summed mapped area in this state is water. County water area can include coastal waters, bays, lakes, or rivers assigned by the Census boundary file; it is shown separately from land and should not be used to estimate developable land.

Frequently asked questions

How many counties are in Massachusetts?

Massachusetts has 14 counties in the U.S. Census Bureau’s 2025 cartographic boundary file.

Can I print this Massachusetts county map?

Yes. Choose Download / print and select PDF for a landscape Letter page, PNG for an image, or SVG for editable vector artwork. Because the map is SVG, its boundary lines stay sharp when scaled.

What is the largest county in Massachusetts?

Worcester County is the largest by land area in this dataset at 1,510.7 square miles. This is an area ranking, not a population ranking.

What is the smallest county in Massachusetts?

Nantucket County is the smallest by land area in this dataset at 46.2 square miles.

Are these legal survey boundaries?

No. This is a generalized reference map. Property, parcel, election, and legal boundary questions should be checked with the relevant state or local agency.

Map source

U.S. Census Bureau, 2025 Cartographic Boundary File, Counties, 1:5,000,000. Land and water area fields are supplied in the same file and converted from square meters to square miles. Accessed September 27, 2026.