• county
  • FIPS 25025
  • Largest town: Boston

Suffolk County, Massachusetts

Suffolk County had 793,144 residents in the Census Vintage 2024 estimate, on 58.3 square miles of land. It ranks 4th of 14 in Massachusetts by population and 13th by land area.

Population
793,144
#4 of 14 in Massachusetts · #84 in US
Area
58.3 sq mi
#13 of 14 in Massachusetts · #3,101 in US
Density
13,614 / sq mi
#1 of 14 in Massachusetts · #7 in US
Median household income
$91,386
#8 of 14 in Massachusetts · #225 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Suffolk County within Massachusetts. Pin: Boston.

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Tools and pages that start from Suffolk County

Suffolk County population, land area and income

Suffolk County had 793,144 residents in the Census Vintage 2024 estimate, on 58.3 square miles of land. It ranks 4th of 14 in Massachusetts by population and 13th by land area. That works out to 13,613.9 people per square mile, 141.4 times the US average of 96.3, and the 7th highest nationally.

The median county-equivalent in Massachusetts has 503,121 residents; Suffolk County is somewhat larger.

Its SAIPE 2023 median household income of $91,386 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

793,144

3144th1st

84th of 3,144 (US)

Land area

58 sq mi

3144th1st

3101st of 3,144 (US)

Density

13,613.9 / sq mi

3144th1st

7th of 3,144 (US)

Median household income

$91,386

3143rd1st

225th of 3,143 (US)

Rank within Massachusetts (14)

Population

793,144

14th1st

4th of 14 (MA)

Land area

58 sq mi

14th1st

13th of 14 (MA)

Density

13,613.9 / sq mi

14th1st

1st of 14 (MA)

Median household income

$91,386

14th1st

8th of 14 (MA)

How Suffolk County's population changed since 2020

Suffolk County lost 4,095 residents between the July 2020 and July 2024 estimates, a drop of 0.5%. That ranks 13th of 14 in Massachusetts for growth. The median Massachusetts county changed by +2.2%, and the state as a whole by +2.0%.

Since the April 2020 estimates base, Suffolk County recorded 35,004 births and 21,937 deaths, a natural change of +13,067. Net international migration added +53,585 and net domestic migration, people moving to or from other US counties, came to -73,169. The largest single component was domestic migration, which removed 73,169 people.

797.2k2020776.3k2021777.3k2022781.7k2023793.1k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
35,004
Deaths
21,937
Net international migration
+53,585
Net domestic migration
-73,169
Change, July 2023 to July 2024
+11,466

Where Suffolk County is

The Census internal point of Suffolk County is at 42.338600, -71.018300. It sits in UTM zone 19N. The map shades Massachusetts's 14 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Suffolk County outlined. Dots are towns of 1,000+ people with residents in it.

Hampshire County: +11.3%Nantucket County: +3.0%Suffolk County: -0.5%Middlesex County: +2.5%Plymouth County: +2.6%Bristol County: +2.0%Hampden County: +0.1%Essex County: +2.0%Berkshire County: -0.8%Worcester County: +2.8%Norfolk County: +2.3%Dukes County: +2.3%Barnstable County: +2.0%Franklin County: -0.1%
Change 2020 to 2024
  1. < -0.1%
  2. < +2.0%
  3. < +2.3%
  4. < +2.6%
  5. ≥ +2.6%
no data

Orange pin: Suffolk County internal point. Dark pin: Boston.

Internal point

Decimal
42.338600, -71.018300
DMS
42°20'18.96"N 71°01'5.88"W
UTM
19N 333735.0E 4689344.5N
Geohash
drt2zgw01
Plus code
87JC8XQJ+CM

Towns in Suffolk County

4 incorporated places of 1,000+ people have residents in Suffolk County, 793,144 people together, or 100% of the county. Each figure counts only the part of the town inside Suffolk County; towns marked "part" extend into another county. The largest is Boston with 673,458.

  1. 01Boston673,458
  2. 02Revere60,702
  3. 03Chelsea40,245
  4. 04Winthrop Town18,739
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Suffolk County

The Census 2024 county adjacency file lists 4 neighbors for Suffolk County. The most populous is Middlesex County, MA, with 1,668,956 residents. Distances run between Census internal points in a straight line.

Distance to Boston and the nearest big city

Boston is 2.7 miles WNW of Suffolk County's internal point in a straight line. The nearest place of 100,000 or more is Boston, MA (population 673,458), 0.0 miles away.

Suffolk County FIPS code

The FIPS code of Suffolk County is 25025: state code 25 for Massachusetts plus county code 025. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $91,386.

Questions people ask

What is the population of Suffolk County, Massachusetts?

The Census Vintage 2024 estimate for July 1, 2024 is 793,144. That is down 4,095 people (0.5%) from the July 2020 estimate of 797,239.

What is the FIPS code of Suffolk County?

25025. The first two digits (25) are Massachusetts; the last three (025) identify the county.

What is the largest town in Suffolk County?

Boston, with 673,458 residents inside Suffolk County in 2024.

Which counties border Suffolk County?

4 county-equivalents border it in the Census 2024 adjacency file: Middlesex County, MA; Essex County, MA; Norfolk County, MA; Plymouth County, MA.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.