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US ZIP Code Profile

ZIP Code 02451
Waltham, Massachusetts

ZIP code 02451 is in Waltham, located in Middlesex County, Massachusetts, within the Boston-Cambridge-Newton metro area. Its 2020 Census population was 17,953. The estimated median adjusted gross income per tax return is $72,396, and about 14% of filers report $200,000 or more.

2020 Population
17,953
Census ZCTA
County
Middlesex
FIPS 25017
Median income (est.)
$72,396
IRS SOI 2022
Land Area
5.525 mi²
+ 0.705 mi² water

01Location & Geography

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

Primary CityWaltham, 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
Coordinates42.397823, -71.2557
Land / Water Area5.525 mi² land · 0.705 mi² water

02Income & Economics

Distribution of the 9,660 individual tax returns filed in 02451 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
19.9%
$25K–$50K
16.8%
$50K–$75K
14.9%
$75K–$100K
11.9%
$100K–$200K
22.7%
$200K+
13.9%
The $200,000+ bracket accounts for 46% of 02451's total adjusted gross income, from 14% of returns — a concentration that drives the gap between the median ($72,396) 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 02451's IRS income metrics, 2020–2022.

Median income (2021→2022)
$72,396
▲ 3.5%
Filers earning $200K+
13.9%
▲ 0.5 pt
Total filers
9,660
▲ 2.5%
GET /zipc/v2/zipcodes/02451/soi?year=… $64K 2020 $70K 2021 $72K 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 02451 ZCTA.

2000
17,650
 
2010
17,426
▼ -1.3%
2020
17,953
▲ +3.0%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 02451. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 02451

Waltham and its immediate neighbors, sorted by distance.

3 mi
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Distance from 02451 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 Number240019
City AliasesNorth Waltham, Waltham

07Frequently Asked Questions

What county is ZIP code 02451 in?

ZIP code 02451 is in Middlesex County, Massachusetts (county FIPS code 25017).

What city is ZIP code 02451?

The primary USPS city for 02451 is Waltham, MA.

What metro area (MSA) is 02451 in?

02451 is part of the Boston-Cambridge-Newton, MA-NH Metro Area (MSA code 14460).

What is the population of ZIP code 02451?

The 2020 Census population of 02451 was 17,953 residents.

What is the median income in ZIP code 02451?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 02451 is about $72,396, with around 14% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.