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ZIP CODE TABULATION AREA

01821

Massachusetts · 30,143 residents · 16.6 sq mi
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With 30,143 people, ZIP 01821 is a ZIP code in Middlesex County. Median household income runs $149,042, well clear of the $82,259 US median. Owners hold 82% of the housing stock. The median age is 44.3, about 5 years above the US median. The typical home is worth $615,100. Median rent is $2,346 a month. Among the 81 ZIP codes in Middlesex County, 01821 ranks 34th by median household income.

$149,042
US average: $82,259
$61,572
US average: $44,673
$615,100
US average: $376,019
40.2%
US average: 35.6%
Land area
16.6 sq mi
Age, sex & households
Under 18
17.4%
Age 65+
19.3%
49.2%
50.8%
2.65 people
Race & ethnicity · 2024
2024
White, non-Hispanic78.9%(23,768)
Black2.6%(793)
Hispanic / Latino3.5%(1,065)
Asian10.1%(3,034)
Other4.9%(1,483)
45
Our index, 0 to 100. Higher means a more even mix of racial and ethnic groups.
Housing
4.1
Years of local income it takes to buy a local home, on a scale of about 0 to 15. Lower is more affordable.
Within Middlesex County
Income rank vs other ZIPs
LOWEST34TH OF 81HIGHEST
Adjacent ZIPs
01431$115,598
01432$101,966
01450$193,292
01460$149,722
Frequently asked

How many people live in ZIP code 01821?

ZIP code 01821 has about 30,143 residents according to the 2024 American Community Survey.

What is the median household income in ZIP code 01821?

The typical household in ZIP code 01821 earns about $149,042 a year. Half of households make more than that, and half make less.

Is ZIP code 01821 expensive?

In ZIP code 01821, the median home is worth about $615,100, and the typical rent is about $2,346 a month.

How educated are people in ZIP code 01821?

About 40.2% of adults age 25 and over in ZIP code 01821 hold a bachelor's degree or higher.

What is the poverty rate in ZIP code 01821?

About 5.3% of people in ZIP code 01821 live below the federal poverty line.

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DATA: US CENSUS BUREAU ACS 5-YEAR · ZCTA · UPDATED 2024