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US ZIP Code Profile

ZIP Code 02121
Dorchester, Massachusetts

ZIP code 02121 is in Dorchester, located in Suffolk County, Massachusetts, within the Boston-Cambridge-Newton metro area. Its 2020 Census population was 28,766. The estimated median adjusted gross income per tax return is $34,739, and about 1% of filers report $200,000 or more.

2020 Population
28,766
Census ZCTA
County
Suffolk
FIPS 25025
Median income (est.)
$34,739
IRS SOI 2022
Land Area
1.745 mi²
+ 0.009 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CityDorchester, MA
CountySuffolk County (FIPS 25025)
StateMassachusetts (FIPS 25)
Metro Area (MSA)Boston-Cambridge-Newton, MA-NH Metro Area (14460)
Census Region / DivisionNortheast Region · New England Division
Coordinates42.306267, -71.0859
Land / Water Area1.745 mi² land · 0.009 mi² water

02Income & Economics

Distribution of the 13,050 individual tax returns filed in 02121 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
37.7%
$25K–$50K
31.6%
$50K–$75K
17.2%
$75K–$100K
6.6%
$100K–$200K
6.0%
$200K+
0.9%
The $200,000+ bracket accounts for 7% of 02121's total adjusted gross income, from 1% of returns — a concentration that drives the gap between the median ($34,739) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 02121's IRS income metrics, 2020–2022.

Median income (2021→2022)
$34,739
▲ 4.5%
Filers earning $200K+
0.9%
▲ 0.1 pt
Total filers
13,050
▼ 0.2%
GET /zipc/v2/zipcodes/02121/soi?year=… $32K 2020 $33K 2021 $35K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 02121 ZCTA.

2000
25,057
 
2010
25,978
▲ +3.7%
2020
28,766
▲ +10.7%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 02121. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 02121

Dorchester and its immediate neighbors, sorted by distance.

3 mi
GET /zipc/v2/distance

Distance from 02121 to any ZIP

Enter a 5-digit ZIP to calculate the distance.

06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypeNon-Postal Community Name, former postal facility or place name
Carrier Route SortB
USPS Finance Number240799
City AliasesBoston, Dorchester, Grove Hall

07Frequently Asked Questions

What county is ZIP code 02121 in?

ZIP code 02121 is in Suffolk County, Massachusetts (county FIPS code 25025).

What city is ZIP code 02121?

The primary USPS city for 02121 is Dorchester, MA.

What metro area (MSA) is 02121 in?

02121 is part of the Boston-Cambridge-Newton, MA-NH Metro Area (MSA code 14460).

What is the population of ZIP code 02121?

The 2020 Census population of 02121 was 28,766 residents.

What is the median income in ZIP code 02121?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 02121 is about $34,739, with around 1% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.