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Zip Code 02138 — Cambridge, MA

02138 is a ZIP Code associated with Cambridge, MA, located within Middlesex. The postal region supports an estimated population of 38,509 residents across Data Pending housing units, with a population density of 5,429.9 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (42.379970, -71.134460)

Data Metric	Local Statistic
Postal / Zip Code	02138
Primary City	Cambridge
State / Province	MA
County	Middlesex
Total Population	38,509
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	5,429.9 people/sq mi
Timezone	America/New_York

How 02138 Compares

Metric	ZIP 02138	Middlesex County	MA State Average
Population	38,509	1,629,277	7,043,978
Median Income	Data Pending	N/A	N/A
Population Density	5,429.9 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 02140	Cambridge	0.9 mi	21,204	N/A
Zip 02163	Boston	1.0 mi	1,817	N/A
Zip 02134	Allston	1.5 mi	17,667	N/A
Zip 02144	Somerville	1.6 mi	25,448	N/A
Zip 02143	Somerville	1.9 mi	25,513	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 →