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US ZIP Code Profile

ZIP Code 02421
Lexington, Massachusetts

ZIP code 02421 is in Lexington, located in Middlesex County, Massachusetts, within the Boston-Cambridge-Newton metro area. Its 2020 Census population was 18,950. The estimated median adjusted gross income per tax return is $160,544, and about 43% of filers report $200,000 or more.

2020 Population
18,950
Census ZCTA
County
Middlesex
FIPS 25017
Median income (est.)
$160,544
IRS SOI 2022
Land Area
9.848 mi²
+ 0.161 mi² water

01Location & Geography

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

Primary CityLexington, MA
CountyMiddlesex County (FIPS 25017)
StateMassachusetts (FIPS 25)
Metro Area (MSA)Boston-Cambridge-Newton, MA-NH Metro Area (14460)
Census Region / DivisionNortheast Region · New England Division
Coordinates42.438545, -71.23957
Land / Water Area9.848 mi² land · 0.161 mi² water

02Income & Economics

Distribution of the 8,580 individual tax returns filed in 02421 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
19.5%
$25K–$50K
8.0%
$50K–$75K
6.4%
$75K–$100K
5.7%
$100K–$200K
17.1%
$200K+
43.2%
The $200,000+ bracket accounts for 89% of 02421's total adjusted gross income, from 43% of returns — a concentration that drives the gap between the median ($160,544) 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 02421's IRS income metrics, 2020–2022.

Median income (2021→2022)
$160,544
▲ 0.1%
Filers earning $200K+
43.2%
▼ 0.2 pt
Total filers
8,580
▲ 2.0%
GET /zipc/v2/zipcodes/02421/soi?year=… $143K 2020 $160K 2021 $161K 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 02421 ZCTA.

2000
16,165
 
2010
17,342
▲ +7.3%
2020
18,950
▲ +9.3%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 02421. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 02421

Lexington and its immediate neighbors, sorted by distance.

3 mi
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Distance from 02421 to any ZIP

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06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypeBranch
Carrier Route SortB
USPS Finance Number240007
City AliasesLexington

07Frequently Asked Questions

What county is ZIP code 02421 in?

ZIP code 02421 is in Middlesex County, Massachusetts (county FIPS code 25017).

What city is ZIP code 02421?

The primary USPS city for 02421 is Lexington, MA.

What metro area (MSA) is 02421 in?

02421 is part of the Boston-Cambridge-Newton, MA-NH Metro Area (MSA code 14460).

What is the population of ZIP code 02421?

The 2020 Census population of 02421 was 18,950 residents.

What is the median income in ZIP code 02421?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 02421 is about $160,544, with around 43% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.