02139 ZIP Code — Cambridge, MA

Middlesex County, Massachusetts

ZIP code 02139 is located in Cambridge, Massachusetts, within Middlesex County. It covers approximately 1.55 square miles and serves a population of 39,856 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 617/781/857/339/978.

About ZIP code 02139

The housing stock consists of a significant share of large multi-unit buildings. Most homes were built in the pre-1940, giving the area an established character. Median home value is $1,027,300. Renters make up the majority at 68%, typical of denser urban areas.

The gap between median ($117,124) and mean household income suggests income inequality — a small number of higher earners pull the average up.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 25 minutes is near the national average. Remote work is prevalent — 23% of workers work from home.

Educational attainment is high — 76% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 02139 reflects a community defined by a highly educated population and a high rate of remote workers.

39,856

population

1.55

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

02139 ZIP code map

Cities in ZIP code 02139

Below are the cities the US Postal Service accepts for ZIP code 02139. Using any city not on this list may result in mail delivery delays.

City	Status
Cambridge	Acceptable
Cambridge	Preferred

Nearby ZIP codes

02142 Cambridge (1.1 mi) 02141 Cambridge (1.1 mi) 02133 Boston (1.2 mi) 02215 Boston (1.4 mi) 02163 Boston (1.4 mi) 02163 Boston (1.4 mi) 02134 Allston (1.5 mi) 02199 Boston (1.5 mi) 02115 Boston (1.6 mi) 02116 Boston (1.6 mi) 02114 Boston (1.7 mi) 02108 Boston (1.9 mi)

Demographics updated 05/2026

Population
Total population	39,856
Population density	25,714 / sq mi
State FIPS	25
County FIPS	017

Geography
Land area	1.55 sq mi
Water area	0.21 sq mi
Latitude	42.3644
Longitude	-71.1012
Timezone	Eastern (ET)
Area code	617/781/857/339/978

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	24.7%	23.8%	31.3%
$50k – $100k	22.2%	23.1%	25.9%
$100k – $200k	30.3%	32.1%	28.5%
Over $200k	22.8%	20.9%	14.3%

Demographics & statistics

39,856

Population

25,714

People per sq mi

29.8

Median age

$117,124

Median household income

$66,716

Per capita income

$1,027,300

Median home value

$2,501

Median monthly rent

32.0%

Home ownership

12.3%

Poverty rate

4.3%

Unemployment

5,989

Housing units

76.4%

Bachelor's or higher

Age distribution

Male Female

845

Under 5

800

635

5–9

601

593

10–14

561

1,524

15–19

1,442

3,147

20–24

2,977

6,051

25–34

5,725

2,450

35–44

2,318

1,711

45–54

1,618

646

55–59

611

788

60–64

746

1,225

65–74

1,158

655

75–84

619

211

85+

199

← Male

Female →

Age summary

Group	Count	%
Under 18	4,651	11.7%
18 and over	35,205	88.3%
65 and over	4,067	10.2%
Median age	29.8 years

Race & ethnicity

White 51.4%

Asian 17.7%

Black or African American 13.2%

Two or more races 8%

Hispanic or Latino 6.9%

Other race 2.6%

Native Hawaiian / Pacific Islander 0.3%

American Indian / Alaska Native 0.1%

Group	Count	%
White	21,992	51.4%
Asian	7,561	17.7%
Black or African American	5,647	13.2%
Two or more races	3,406	8%
Hispanic or Latino	2,960	6.9%
Other race	1,104	2.6%
Native Hawaiian / Pacific Islander	110	0.3%
American Indian / Alaska Native	36	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	24.7%	23.8%	31.3%
$50k – $100k	22.2%	23.1%	25.9%
$100k – $200k	30.3%	32.1%	28.5%
Over $200k	22.8%	20.9%	14.3%

Under $10k 4.3%

$10k–$15k 4.0%

$15k–$25k 4.9%

$25k–$35k 5.5%

$35k–$50k 4.7%

$50k–$75k 10.3%

$75k–$100k 10.5%

$100k–$150k 16.6%

$150k–$200k 13.1%

$200k+ 26.1%

Range	% of households
Under $10k	4.3%
$10k–$15k	4.0%
$15k–$25k	4.9%
$25k–$35k	5.5%
$35k–$50k	4.7%
$50k–$75k	10.3%
$75k–$100k	10.5%
$100k–$150k	16.6%
$150k–$200k	13.1%
$200k+	26.1%
Median income	$117,124

Housing

Home values

Under $50k 0.7%

$50k–$100k 0.3%

$100k–$150k 0.6%

$150k–$200k 1.8%

$200k–$300k 2.5%

$300k–$500k 2.9%

$500k–$1M 38.3%

$1M+ 52.9%

Housing overview

Metric	Value
Median home value	$1,027,300
Median rent / month	$2,501
Owner occupied	32.0%
Renter occupied	68.0%
Vacant	5.2%
Single-family detached	8.3%
Large apartment buildings	26.1%
Mobile homes	0.0%
Median rooms	4.3
Avg household size (owned)	2.38

Year built

Era	%
2020 or later	0.0%
2010–2019	2.9%
2000–2009	8.0%
1990–1999	4.2%
1980–1989	9.9%
1970–1979	10.6%
1960–1969	6.3%
1950–1959	5.1%
1940–1949	2.9%
1939 or earlier	50.2%

Bedrooms

Size	% of units
No bedroom (studio)	5.5%
1 bedroom	25.7%
2 bedrooms	34.8%
3 bedrooms	24.7%
4 bedrooms	6.5%
5+ bedrooms	2.8%

Vehicles per household

Vehicles	% of households
No vehicle	38.7%
1 vehicle	44.3%
2 vehicles	14.5%
3 or more	2.5%

Heating fuel

Fuel type	%
Utility gas	68.2%
Electricity	24.0%
Propane / LP gas	2.5%
Fuel oil	3.1%
Solar	0.3%
No fuel used	1.1%

Households & families

Household type	Count	%
Married-couple family	4,473	28.0%
Cohabiting couple	1,707	10.7%
Male householder, no spouse	4,326	27.0%
Female householder, no spouse	5,489	34.3%
Households with children under 18	2,671	16.7%
Households with seniors (65+)	3,225	20.2%
Average household size	2.15

Marital status

Status	Male	Female
Never married	66.6%	60.0%
Married	28.7%	27.8%
Separated	0.2%	1.8%
Widowed	0.5%	3.8%
Divorced	4.0%	6.6%

Education

Less than 9th grade 3.5%

Some HS, no diploma 2.2%

HS graduate 7.4%

Some college, no degree 8.2%

Associate's degree 2.3%

Bachelor's degree 31.6%

Graduate / professional 44.8%

Metric	%
HS diploma or higher	94.3%
Bachelor's or higher	76.4%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	545	4.0%
Kindergarten	296	2.2%
Elementary school	1,963	14.5%
High school	771	5.7%
College / grad school	9,923	73.5%

Employment

Industry of employment

Education & healthcare 41.3%

Professional & management 25.2%

Finance & real estate 5.5%

Manufacturing 5.4%

Retail trade 4.4%

Arts, food & hospitality 4.4%

Other services 3.5%

Information 3.4%

Public administration 2.3%

Transportation & utilities 2.2%

Construction 1.3%

Wholesale trade 0.8%

Agriculture & mining 0.3%

Occupation

Category	%
Management, business & arts	79.6%
Service	6.8%
Sales & office	9.2%
Natural resources & construction	1.3%
Production & transportation	3.1%

Employment type

Type	%
Private sector	86.8%
Government	9.6%
Self-employed	3.5%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	17.8%
Carpool	2.6%
Public transit	22.8%
Walk	23.6%
Work from home	23.4%
Other means	9.8%
Avg commute (minutes)	25.2

Poverty

All people 12.3%

Under 18 years 15.1%

18 and over 11.9%

Married-couple families 3.8%

Female-led households 17.3%

Income support

Source	% of households
Social Security	16.7%
Retirement income	11.9%
Supplemental Security	4.0%
Cash public assistance	3.3%
Food stamps / SNAP	11.0%

Health indicators

Condition	%
Obesity	19.2%
High blood pressure	18.2%
High cholesterol	19.5%
Diabetes	4.8%
Heart disease	2.6%
Stroke	1.4%
Asthma	9.8%
Arthritis	12.1%
Kidney disease	1.6%
Pulmonary disease	2.5%
Cancer	3.7%

Behavior / access	%
Smoking	8.1%
Binge drinking	18.9%
No physical activity	13.3%
Less than 7 hrs sleep	28.6%
Depression	17.2%
Fair or poor health	6.4%
Poor mental health	13.3%
Poor physical health	5.1%
No health insurance	5.5%
Visited doctor (checkup)	72.3%
Visited dentist	74.5%
Cholesterol screening	87.2%
Teeth loss	7.5%

Veterans & disability

Veterans	Count	%
Civilian veterans	501	1.4%

Disability	%
Any disability	7.5%
Under 18	3.1%
18–64 years	5.7%
65 and over	26.5%

Health insurance coverage

Type	%
Private insurance	82.8%
Public insurance	22.8%
No insurance	1.6%
Uninsured under 19	0.2%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	38,211	95.9%
Spanish	3,090	8.1%
Other Indo-European	677	1.8%
Asian & Pacific Islander	940	2.5%
Other languages	869	2.3%

Place of birth & citizenship

Origin	Count	%
Native born (US)	28,301	71.0%
Born in same state	27,070	67.9%
Born in different state	12,100	30.4%
Foreign born	1,231	3.1%
Naturalized citizen	11,555	29.0%
Not a US citizen	5,420	46.9%

Ancestry

Ancestry	Count	%
Italian	3,851	9.7%
French	2,583	6.5%
Arab	943	2.4%
German	428	1.1%
Polish	334	0.8%

Ancestry	Count	%
English	226	0.6%
Norwegian	197	0.5%
Dutch	155	0.4%
Irish	93	0.2%

Technology access

Metric	% of households
Computer access	40.1%
Internet access	96.8%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 02139

What city is ZIP code 02139 in?

ZIP code 02139 is primarily assigned to Cambridge, Massachusetts.

What county is ZIP code 02139 in?

ZIP code 02139 falls within Middlesex County, Massachusetts.

How educated is the population of ZIP code 02139?

76% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Is ZIP code 02139 mostly rentals?

68% of occupied units in ZIP code 02139 are renter-occupied.

What is the typical home value in ZIP code 02139?

The median home value in ZIP code 02139 is $1,027,300.

What is the median household income in ZIP code 02139?

The median household income in ZIP code 02139 is $117,124, above the national median of ~$75,000.

What timezone is ZIP code 02139 in?

ZIP code 02139 observes the EST timezone.