02139 — Cambridge, Massachusetts
Area Profile
Income, jobs, climate, physical risk and development data for ZIP code 02139.
02139 ranks in the top 15% of published ZIP profiles for employment opportunity, with unemployment at 3.4% and median household income of $134,586.
Buying strains local incomes far more than renting does — the median home is 8.1 times median household income, against a historic benchmark near three — while rent takes 24% of it.
Natural-hazard exposure is lower than in most comparable published ZIP profiles, placing 02139 in the top 13% for physical resilience.
At a glance
Jobs & opportunity
Unemployment of 3.4% is lower than 89% of the 6,544 measured US ZIP areas.
Employment fell 1.7% over the past year, to 70,726 employed residents.
79% of adults hold a four-year degree, higher than 98% of measured US ZIP areas.
Household income is higher than at least 94% of measured US ZIP areas.
| Metric | Value | Compared with peers | Source period |
|---|---|---|---|
| Median household income ±$8,697 | $134,586 | Top 6% | 2024 ACS 5-Year |
| Per capita income ±$3,210 | $74,801 | Top 5% | 2024 ACS 5-Year |
| Poverty rate | 13.0% | Top 39% | 2024 ACS 5-Year |
| Average commute | 26.5 min | Bottom 43% | 2024 ACS 5-Year |
| Bachelor's degree or higher | 79.5% | Top 2% | 2024 ACS 5-Year |
| Employment | 70,726 | Top 42% | June 2026 |
| Employment change (3 years) | 0.4% | Top 45% | June 2026 |
| Employment change (year over year) | -1.7% | Bottom 26% | June 2026 |
| Labor force | 73,191 | Top 43% | June 2026 |
| Labor force participation | 71.9% | Top 11% | 2024 ACS 5-Year |
| Mean annual wage | $89,620 | Top 8% | 2025 OEWS |
| Median annual wage | $66,620 | Top 8% | 2025 OEWS |
| Unemployment change (year over year) | -0.5% | Bottom 18% | June 2026 |
| Unemployment rate | 3.4% | Bottom 11% | June 2026 |
| Occupation | People employed | Median annual wage |
|---|---|---|
| Home Health and Personal Care Aides | 72,420 | $40,910 |
| General and Operations Managers | 70,950 | $133,800 |
| Registered Nurses | 64,240 | $106,180 |
| Retail Salespersons | 64,150 | $36,850 |
| Fast Food and Counter Workers | 60,130 | $36,290 |
| Janitors and Cleaners, Except Maids and Housekeeping Cleaners | 43,160 | $46,550 |
Occupational employment and wages are published for metropolitan areas rather than for individual cities or ZIP areas, so these describe the wider labor market this location sits in. 2025 OEWS, U.S. Bureau of Labor Statistics.
The Bureau of Labor Statistics does not publish labor-force data for ZIP areas. This is the figure for Cambridge, MA, the city containing this ZIP code.
Schools
How it’s calculated →34% of students met the state standard in mathematics and 55% in reading, across the schools here that reported results.
There are 9.8 students for every full-time teacher, fewer than in most measured places.
| School | District | Students | Per teacher | Math | Reading |
|---|---|---|---|---|---|
| Prospect Hill Academy Charter School · charter | Prospect Hill Academy Charter | 890 | 10.6 | 17% | 36% |
| Amigos School | Cambridge | 413 | 11.2 | 36% | 65% |
| King Open | Cambridge | 391 | 10.6 | 29% | 51% |
| Martin Luther King Jr. | Cambridge | 340 | 10.3 | 62% | 73% |
| Morse | Cambridge | 328 | 10.3 | 44% | 64% |
| John M Tobin | Cambridge | 291 | 10.8 | 67% | 85% |
| Putnam Avenue Upper School | Cambridge | 283 | 9.1 | 35% | 55% |
| Cambridgeport | Cambridge | 263 | 9.7 | 36% | 60% |
| Fletcher/Maynard Academy | Cambridge | 249 | 7.3 | 29% | 51% |
| Kennedy-Longfellow | Cambridge | 215 | 7.2 | 16% | 36% |
Public schools only, from the NCES Common Core of Data. Schools are placed by ZIP code, so this is which schools are in this place rather than which one a particular address is zoned for — district boundaries do not follow municipal ones, and enrollment zones change. Fully virtual schools are excluded: they enroll students from across the state while reporting one administrative address, and counting them here would describe a school population this place does not have. The assessment covers grades 3 through 8, so a high school shows no proficiency figure — a dash in those columns means the test was not given at that school, not that it performed badly. Proficiency is measured against Massachusetts’s own standard, so it compares cleanly within the state and only broadly against other states; AreaProfile therefore ranks it within state. The directory is current, while the proficiency figures are from the last school year with national coverage before the pandemic interrupted testing.
Housing & affordability
How it’s calculated →Median rent of $2,691 takes 24% of median household income, below the 30% threshold at which a household is considered cost-burdened.
A median home costs 8.1 times median household income here, well above the historic benchmark, at a level conventionally described as seriously unaffordable.
| Metric | Value | Compared with peers | Source period |
|---|---|---|---|
| Home price to income | 8.08 | Top 4% | 2024 ACS 5-Year |
| Homeownership rate | 32.2% | Bottom 4% | 2024 ACS 5-Year |
| Housing units ±575 | 17,034 | Top 6% | 2024 ACS 5-Year |
| Median gross rent ±$89 | $2,691 | Top 2% | 2024 ACS 5-Year |
| Median home value ±$59,104 | $1,087,500 | Top 2% | 2024 ACS 5-Year |
| Rent as a share of income | 24.0% | Top 18% | 2024 ACS 5-Year |
| Vacancy rate | 6.0% | Bottom 28% | 2024 ACS 5-Year |
Both affordability measures come from the same ACS release as the income they are compared with, so the comparison is like for like. They describe housing cost against local earnings and are not a cost-of-living index — transport, groceries, healthcare, insurance and taxes are not included, and a place can look affordable here and still be expensive to live in for reasons this does not capture.
Growth & development
How it’s calculated →An AreaProfile calculation combining permit volume per resident, its direction over one and three years, population change and employment growth. Permit volume alone is not the measure.
83% of recently permitted units are in buildings of five or more homes, so new supply is concentrated in apartments and condominiums rather than detached houses.
At 2.8 permitted units per 1,000 residents, building activity is below the median for measured US ZIP areas.
The Building Permits Survey is not published for ZIP areas. This is the figure for Cambridge, MA, the city containing this ZIP code.
Weather & climate
5 of the twelve months have a normal average temperature between 55°F and 80°F. July averages a high of 82°F and January a low of 23°F.
Normal annual precipitation is 43.6 inches, including 49.2 inches of snow.
| Metric | Value | Source period |
|---|---|---|
| Annual precipitation | 43.6" | 1991-2020 Normals |
| Annual snowfall | 49.2" | 1991-2020 Normals |
| Average January low | 23°F | 1991-2020 Normals |
| Average July high | 82°F | 1991-2020 Normals |
| Comfortable months | 5 | 1991-2020 Normals |
| Seasonal temperature swing | 44°F | 1991-2020 Normals |
Climate figures are thirty-year normals, not current conditions. They describe what a typical year looks like rather than what the weather is doing today.
Physical risk
The hazards accounting for most of this area's expected annual loss are hurricane, earthquake and heat wave.
Low or minimal exposure: inland flooding, lightning, strong wind, cold wave, tornado, wildfire, winter weather, coastal flooding, landslide, hail.
Hazard ratings are AreaProfile calculations derived from the FEMA National Risk Index v1.20.0 (December 2025). FEMA publishes at county level. ZIP values are the land-area-weighted mean of the counties the ZIP Code Tabulation Area intersects. Expected annual loss is not allocated below county level. FEMA does not endorse this presentation. Higher physical resilience means lower exposure.
What this profile does not cover
Three things people look for are missing from every AreaProfile page, and each is missing for a reason rather than by oversight. The Area Score is calculated without them and the weighting is documented on the methodology page.
- Crime
- The FBI’s Crime Data Explorer is the only source with national coverage and a published method, and it requires an API key AreaProfile does not hold. Arrest counts, news volume and commercial “safety scores” are not substituted in the meantime. Reported crime is also easy to misread: agency participation varies year to year, and a city that draws a large daytime workforce carries incidents its residents did not generate.
- Taxes
- No tax dataset has met the source admission test for coverage, transparent methodology and update cadence. Nothing here is individualized tax advice.
- Full cost of living
- No public source publishes one with national coverage and a documented method. Housing affordability above is computed from published rent, price and income, and excludes transport, groceries, healthcare, insurance and taxes — commuting cost in particular tends to offset suburban housing savings.
Access
5 major airports lie within 100 miles, the nearest 5 miles away.
| Airport | Code | Distance | Longest runway |
|---|---|---|---|
| General Edward Lawrence Logan Intl | BOS | 5 mi | 10,083 ft |
| Manchester Boston Rgnl | MHT | 43 mi | 9,250 ft |
| Rhode Island TF Green Intl | PVD | 47 mi | 8,700 ft |
Airport identity, position and runway data come from the FAA. “Major airport” is an AreaProfile classification — a public-use civil airport with a paved runway of at least 8,000 feet — not an FAA hub designation. Distances are straight-line, not driving distance.
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Similar places
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Data & methodology
| Used for | Source | Source period | Updated |
|---|---|---|---|
| Access | Federal Aviation Administration Airports (NASR) — Aeronautical Data Delivery Service | NASR current cycle | 28-day NASR cycle |
| Physical risk | Federal Emergency Management Agency National Risk Index | National Risk Index December 2025 (v1.20.0) | Periodic dataset versions (v1.20.0 current) |
| Climate | NOAA National Centers for Environmental Information U.S. Climate Normals 1991–2020 (Monthly) | 1991-2020 Normals | Every ten years (next release follows the 2001–2030 period) |
| Jobs | U.S. Bureau of Labor Statistics Local Area Unemployment Statistics | June 2026 | Monthly |
| Jobs | U.S. Bureau of Labor Statistics Occupational Employment and Wage Statistics | 2025 OEWS | Annual (spring release) |
| Demographics | U.S. Census Bureau Population Estimates Program | July 1, 2024 estimate | Annual (vintage released each spring) |
| Development | U.S. Census Bureau Building Permits Survey | 12 months ending July 2026 | Monthly, roughly three weeks after the reference month |
| Demographics, Housing, Income, Jobs | U.S. Census Bureau American Community Survey 5-Year Estimates (Table-Based Summary File) | 2024 ACS 5-Year | Annual (5-year estimates released each December) |
| schools | U.S. Department of Education, National Center for Education Statistics Common Core of Data and EDFacts assessments | 2019-20 school year; 2024-25 school year | Directory annually; assessment results as EDFacts releases them |
Profile recalculated August 30, 2026. Recalculation is not the same as new source data — each figure above shows the period its source actually covers. Read the full methodology or browse every source.
02139 vs Cambridge
How this ZIP area compares with Cambridge as a whole. Both figures come from the same ACS release, so the comparison is like for like.
Some demographic statistics use Census ZIP Code Tabulation Areas, which approximate but do not exactly match USPS ZIP delivery geography. See the methodology for how AreaProfile maps between them.