🇺🇸 United States ZIP Code

STANDARD

02139

Cambridge

ZIP Code 02139 is a standard zip code serving Cambridge, Cambridge, Massachusetts (MA), in Middlesex County, United States. It has an estimated population of 36,349 with a median household income of $71,745. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Massachusetts (MA)
County: Middlesex
City: Cambridge
Timezone: America/New_York

Coordinates

Latitude: 42.364700
Longitude: -71.104200

Geographic Details

Land Area: 1.56 mi²
Water Area: 0.14 mi²
Population Density: 23355.0 people per mi² (95th percentile)
Bounding Box: 42.376332°N, 42.352397°S, -71.086975°E, -71.117193°W

With 36,349 residents spread across 1.56 square miles, this area has a population density of 23355.0 people per square mile.

Demographics

36,349

Population

90th percentile

$71,745

Median Income

85th percentile

$488,800

Median Home Value

95th percentile

1.56 mi²

Land Area

The median household income in 02139 is $71,745, and the median home value is $488,800. This places the area in the top 25% nationally for household income.

Housing

15,402

Total Units

14,519

Occupied Units

94.3%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Cambridge, MA.

02138

Cambridge

02140

Cambridge

02141

Cambridge

02142

Cambridge

02238

Cambridge

Similar ZIP Codes in Massachusetts

ZIP codes with similar median household income in Massachusetts.

02739

Mattapoisett

$78,864

01028

East Longmeadow

$80,469

01235

Hinsdale

$64,420

02575

West Tisbury

$70,963

01606

Worcester

$66,912

02762

Plainville

$77,109

01537

North Oxford

$72,607

01527

Millbury

$71,832

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.