🇺🇸 United States ZIP Code

STANDARD

02138

Cambridge

ZIP Code 02138 is a standard zip code serving Cambridge, Cambridge, Massachusetts (MA), in Middlesex County, United States. It has an estimated population of 36,314 with a median household income of $75,446. 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: 42.377000
Longitude: -71.125600

Geographic Details

Land Area: 2.74 mi²
Water Area: 0.32 mi²
Population Density: 13251.0 people per mi² (95th percentile)
Bounding Box: 42.395886°N, 42.364229°S, -71.105427°E, -71.160488°W

With 36,314 residents spread across 2.74 square miles, this area has a population density of 13251.0 people per square mile.

Demographics

36,314

Population

90th percentile

$75,446

Median Income

85th percentile

$669,500

Median Home Value

95th percentile

2.74 mi²

Land Area

The median household income in 02138 is $75,446, and the median home value is $669,500. This places the area in the top 25% nationally for household income.

Housing

14,949

Total Units

13,959

Occupied Units

93.4%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Cambridge, MA.

02139

Cambridge

02140

Cambridge

02141

Cambridge

02142

Cambridge

02238

Cambridge

Similar ZIP Codes in Massachusetts

ZIP codes with similar median household income in Massachusetts.

02464

Newton Upper Falls

$81,771

01527

Millbury

$71,832

01611

Cherry Valley

$67,179

02453

Waltham

$67,382

01039

Haydenville

$72,188

02537

East Sandwich

$79,180

01095

Wilbraham

$86,667

02032

East Walpole

$77,955

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.