County Dossier

Middlesex County

Massachusetts | County

Population

1,638,365

Land Area

817.9 sq mi

Context

Metro

Geography

County silhouette

Land Area
817.9 sq mi
Water Area
29.0 sq mi
Water Share
3.4%

Terrain Layer

Open the county terrain view inside the atlas flow.

Terra Firma

Population & Housing

Population

1,638,365

Density
2,003.1 / sq mi
Households
634,215
Housing Units
664,267
Median Age
38.9 years

Income & Economy

Median Household Income

$130,847

GDP

$240.67B

Real GDP Change+3.1%
Per Capita Income
$69,556
Personal Income
$186.94B
Personal Income Per Capita
$112,011

Classification

RUCC 1
Metro

Counties in metro areas of 1 million population or more

Relief

Min

-43 ft

Mean

226 ft

Max

1,586 ft

Provenance

GEOID 25017 ANSI 00606935
Latitude 42.48172 Longitude -71.39492
Canonical 2025 Gazetteer ACS ACS 2020-2024 5-year BEA BEA county 2024 release (2026-02-05) BLS BLS LAUS 2024 annual average USDA USDA RUCC 2023 USGS USGS 3DEP published as of 2026-03-23