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Zip Code 02451 — Waltham, MA

02451 is a ZIP Code associated with Waltham, MA, located within Middlesex. The postal region supports an estimated population of 17,393 residents across Data Pending housing units, with a population density of 1,262.3 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (42.398590, -71.257300)

Data Metric	Local Statistic
Postal / Zip Code	02451
Primary City	Waltham
State / Province	MA
County	Middlesex
Total Population	17,393
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	1,262.3 people/sq mi
Timezone	America/New_York

How 02451 Compares

Metric	ZIP 02451	Middlesex County	MA State Average
Population	17,393	1,629,277	7,043,978
Median Income	Data Pending	N/A	N/A
Population Density	1,262.3 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 02452	Waltham	1.9 mi	15,808	N/A
Zip 02453	Waltham	2.2 mi	31,591	N/A
Zip 02421	Lexington	2.9 mi	18,080	N/A
Zip 01773	Lincoln	3.3 mi	4,891	N/A
Zip 02493	Weston	3.5 mi	11,579	N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →