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US ZIP Code Profile

ZIP Code 02129
Charlestown, Massachusetts

ZIP code 02129 is in Charlestown, located in Suffolk County, Massachusetts, within the Boston-Cambridge-Newton metro area. Its 2020 Census population was 19,120. The estimated median adjusted gross income per tax return is $98,481, and about 25% of filers report $200,000 or more.

2020 Population
19,120
Census ZCTA
County
Suffolk
FIPS 25025
Median income (est.)
$98,481
IRS SOI 2022
Land Area
1.351 mi²
+ 0.486 mi² water

01Location & Geography

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

Primary CityCharlestown, 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
Coordinates42.379658, -71.061485
Land / Water Area1.351 mi² land · 0.486 mi² water

02Income & Economics

Distribution of the 9,750 individual tax returns filed in 02129 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
15.3%
$25K–$50K
12.4%
$50K–$75K
12.0%
$75K–$100K
11.0%
$100K–$200K
23.9%
$200K+
25.4%
The $200,000+ bracket accounts for 70% of 02129's total adjusted gross income, from 25% of returns — a concentration that drives the gap between the median ($98,481) 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 02129's IRS income metrics, 2020–2022.

Median income (2021→2022)
$98,481
▲ 7.3%
Filers earning $200K+
25.4%
▲ 1.0 pt
Total filers
9,750
▼ 1.9%
GET /zipc/v2/zipcodes/02129/soi?year=… $81K 2020 $92K 2021 $98K 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 02129 ZCTA.

2000
15,195
 
2010
16,439
▲ +8.2%
2020
19,120
▲ +16.3%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 02129. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 02129

Charlestown and its immediate neighbors, sorted by distance.

3 mi
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Distance from 02129 to any ZIP

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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, Charlestown

07Frequently Asked Questions

What county is ZIP code 02129 in?

ZIP code 02129 is in Suffolk County, Massachusetts (county FIPS code 25025).

What city is ZIP code 02129?

The primary USPS city for 02129 is Charlestown, MA.

What metro area (MSA) is 02129 in?

02129 is part of the Boston-Cambridge-Newton, MA-NH Metro Area (MSA code 14460).

What is the population of ZIP code 02129?

The 2020 Census population of 02129 was 19,120 residents.

What is the median income in ZIP code 02129?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 02129 is about $98,481, with around 25% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.