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US ZIP Code Profile

ZIP Code 02127
South Boston, Massachusetts

ZIP code 02127 is in South Boston, located in Suffolk County, Massachusetts, within the Boston-Cambridge-Newton metro area. Its 2020 Census population was 37,939. The estimated median adjusted gross income per tax return is $82,595, and about 15% of filers report $200,000 or more.

2020 Population
37,939
Census ZCTA
County
Suffolk
FIPS 25025
Median income (est.)
$82,595
IRS SOI 2022
Land Area
2.023 mi²
+ 0.614 mi² water

01Location & Geography

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

Primary CitySouth Boston, 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
Coordinates42.33499, -71.03909
Land / Water Area2.023 mi² land · 0.614 mi² water

02Income & Economics

Distribution of the 21,930 individual tax returns filed in 02127 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
12.3%
$25K–$50K
14.0%
$50K–$75K
18.6%
$75K–$100K
16.7%
$100K–$200K
23.2%
$200K+
15.2%
The $200,000+ bracket accounts for 53% of 02127's total adjusted gross income, from 15% of returns — a concentration that drives the gap between the median ($82,595) 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 02127's IRS income metrics, 2020–2022.

Median income (2021→2022)
$82,595
▲ 8.2%
Filers earning $200K+
15.2%
▲ 0.9 pt
Total filers
21,930
▲ 1.3%
GET /zipc/v2/zipcodes/02127/soi?year=… $71K 2020 $76K 2021 $83K 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 02127 ZCTA.

2000
29,456
 
2010
31,799
▲ +8.0%
2020
37,939
▲ +19.3%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 02127. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 02127

South Boston and its immediate neighbors, sorted by distance.

3 mi
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Distance from 02127 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, S Boston, South Boston

07Frequently Asked Questions

What county is ZIP code 02127 in?

ZIP code 02127 is in Suffolk County, Massachusetts (county FIPS code 25025).

What city is ZIP code 02127?

The primary USPS city for 02127 is South Boston, MA.

What metro area (MSA) is 02127 in?

02127 is part of the Boston-Cambridge-Newton, MA-NH Metro Area (MSA code 14460).

What is the population of ZIP code 02127?

The 2020 Census population of 02127 was 37,939 residents.

What is the median income in ZIP code 02127?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 02127 is about $82,595, with around 15% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.