Barnstable County, Massachusetts

County seat: Barnstable · Population 233,539 (2025) · 394 sq mi

Barnstable County is the 9th most populous of Massachusetts's 14 counties, with 233,539 people (2025 estimate). Its county seat is Barnstable. The map shows its 1 city or town and the 3 neighboring counties.

Map of Barnstable County, Massachusetts with cities, towns and the county boundary
Barnstable County, Massachusetts with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
Download PDF (Letter) 143 KBPNG image 129 KBMassachusetts county map

Barnstable County facts

County seat
Barnstable
Population (2025 estimate)
233,539 +2% since 2020
Land area
394 sq mi 11th largest of 14
Water area
911 sq mi
Population density
593 per sq mi
Established
1685
Named after
Barnstable town in Massachusetts, United States
Largest city
Barnstable Town 50,101
Median household income
$95,241
Cities and towns
1 plus 39 CDPs
ZIP codes
48
Time zone
Eastern
FIPS code
25001

Cities and towns in Barnstable County

Barnstable County has 1 incorporated place. Populations count the people living inside Barnstable County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Barnstable TownCity50,101

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
South Yarmouth11,552
East Falmouth6,245
West Yarmouth6,194
Yarmouth Port5,961
East Harwich5,654
Sagamore4,072
Falmouth3,954
Northwest Harwich3,932
East Sandwich3,864
Forestdale3,801
Dennis Port3,691
Provincetown3,452
Monument Beach3,277
South Dennis3,135
East Dennis3,062
Buzzards Bay2,909
Sandwich2,890
North Falmouth2,838
West Dennis2,556
Dennis2,424
Pocasset2,247
Harwich Port2,238
North Eastham2,085
Brewster1,994
Bourne1,806
Harwich Center1,774
Teaticket1,759
Chatham1,600
Orleans1,480
West Falmouth1,325
West Chatham1,258
Woods Hole988
Mashpee Neck908
New Seabury726
Popponesset563
Seabrook530
Seconsett Island168
Monomoscoy Island141
Popponesset Island33

ZIP codes in Barnstable County

48 ZIP codes reach into Barnstable County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Barnstable County, 2020–2025

Barnstable County grew by 4,475 people (+2%) between April 2020 and July 2025: 9,046 more deaths than births and a net gain of 14,206 people from migration.

Year (July 1)Population
2020228,055
2021232,449
2022232,970
2023233,592
2024233,951
2025233,539

Neighboring counties

Printable Barnstable County map

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Sources

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