Residential delivery area · Massachusetts
ZIP Code 02139: Cambridge, MA
ZIP code 02139 is in Cambridge, Massachusetts, entirely in Middlesex County (Census 2020 ZIP-county file). About 40,000 people live there (Census Bureau, ACS 2020-2024), the most populous of Cambridge's 5 residential ZIP codes. Median household income is $134,586 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
- FHFA2021
- ZBP2023
- IRS2022
- Town
- Cambridge · 5 residential ZIPs
- County
- Middlesex County
- Census places
- Cambridge
- Neighborhoods
- Cambridgeport, Mid-Cambridge GeoNames
- Metro area
- Boston-Cambridge-Newton, MA-NH
- House districts
- MA-7 (86%), MA-5 (14%) 119th Congress, by share of land
- State
- Massachusetts
- Time zone
- Eastern
- Land area
- 1.6 sq mi · 25,794 people per sq mi
- PO Box ZIPs
- 02238 also use the name Cambridge
Where is ZIP code 02139?
02139 centers on 42.362°, -71.102° and covers 1.6 square miles of land plus 0.2 of water. It borders 7 ZIP codes: 02215, 02141, 02142, 02143, 02134, 02116, 02138.
The map draws ZIP code areas only. For the streets inside 02139, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0); neighborhoods from the GeoNames gazetteer (CC BY 4.0), placed in this ZIP code by PlainZIP.
How does 02139 compare with the rest of Cambridge?
| Measure | 02139 | In Cambridge | In Middlesex County | In MA |
|---|---|---|---|---|
| People (ACS 2020-2024) | 40,033 | 1st of 5 | 6th of 83 | 27th of 539 |
| Median household income | $135k | 3rd of 5 | 46th of 78 | 115th of 406 |
| Median home value | $1.09M | 4th of 5 | 21st of 80 | 36th of 449 |
Its median household income is higher than in 94% of U.S. residential ZIP codes, and it is denser than 99% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 02139?
The 2020 Census counted 39,525 people in 02139; the ACS, which samples households over 2020-2024, estimates 40,033. Between the 2010 and 2020 censuses its population grew 8.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 40,033
- 2020 Census count
- 39,525+8.7% since 2010 (36,349)
- Households
- 16,012
- Median age
- 30.0
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 02139?
Of the 40,033 people the ACS estimates in 02139, 11.0% are under 18 and 11.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (51.2%), then Asian (not Hispanic) (21.9%).
- Under 1811.0%
- 18 to 6477.6%
- 65 and older11.4%
- White, not Hispanic51.2%
- Asian, not Hispanic21.9%
- Black, not Hispanic11.2%
- Hispanic or Latino8.5%
- Other or two or more7.1%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 02139 earn?
Median household income is $134,586 (ACS 2020-2024), the 46th highest of the 78 ranked ZIP codes in Middlesex County. It is not measurably different from 2015-2019 ($128,909 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $134,586
- Income per person
- $74,801
- Below the poverty line
- 13.0%
- Unemployed (of the labor force)
- 4.0%
- Adults 25+ with a bachelor's degree
- 79.5%
- Adjusted gross income per tax return, 2022
- $126,60218,550 returns; wages 74% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 02139?
- Median home value (owners' estimate)
- $1,087,500
- Median gross rent
- $2,691
- Homes owned by their occupants
- 32.2%
- Housing units
- 17,034
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 02139?
1,118 business establishments had a location in this ZIP code in 2023, 39 fewer than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services352
- Accommodation and food services158
- Health care and social assistance115
- Other services (except public administration)95
- Retail trade74
- Real estate and rental and leasing56
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 02139?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 02215 | Boston | 24,581 | $72k | 1.0 mi |
| 02141 | Cambridge | 14,517 | $127k | 1.1 mi |
| 02142 | Cambridge | 4,737 | $148k | 1.1 mi |
| 02143 | Somerville | 25,513 | $131k | 1.3 mi |
| 02134 | Allston | 17,667 | $79k | 1.4 mi |
| 02116 | Boston | 21,978 | $127k | 1.5 mi |
| 02138 | Cambridge | 38,509 | $120k | 2.1 mi |
| 02163 | Boston | 1,817 | $85k | 1.2 mi (near) |
| 02199 | Boston | 1,292 | $122k | 1.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.