What city is 02139 in?

02139 is a Cambridge, MA mailing address. By land area, 100% lies inside Cambridge.

What is the population of 02139?

About 40,033 people (±1,280), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 39,525.

What is the median household income in 02139?

$134,586 (±$8,697), compared with $103,960 for Massachusetts as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 02139?

23 USPS carrier routes with 15,488 residential and 1,298 business mailboxes (16,786 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 02139?

The closest, measured center to center: 02215 (1 mi, Boston), 02141 (1.1 mi, Cambridge), 02142 (1.1 mi, Cambridge), 02163 (1.2 mi, Boston), 02143 (1.3 mi, Somerville) and 02134 (1.4 mi, Boston).

02139 ZIP Code, Cambridge, MA

02139 is a ZIP code in Cambridge, Massachusetts in Middlesex County. It covers 1.6 square miles of land. The closest ZIP codes are 02215, 02141 and 02142. 40,033 people live here in 16,012 households, more than in 9 of every 10 Massachusetts ZIP codes. It is densely built, at about 25,794 people per square mile, and most households rent (32% own). Median household income is $134,586, above the Massachusetts median of $103,960; the median age is 30.0, younger than most ZIP codes.

Quick facts

Mailing city: Cambridge, MA
County: Middlesex County
Land area: 1.6 sq mi
Population: 40,033
Median household income: $134,586
Carrier routes: 23 (15,488 homes)

Key figures

Measure	Value
Residents	40,033
Households	16,012
Median household income	$134,586
Income per person	$74,801
Median age	30
Homeowners	32.2%
Median home value	$1,087,500
Median rent	$2,691
Bachelor's degree or higher	79.5%
Average commute (minutes)	24.4
Households with kids under 18	17.0%
Moved in the past year	23.7%
Below the poverty line	13.0%
Broadband internet	95.6%
Speak a non-English language at home	35.8%

Household income

% of households	Value
<$10K	4.5%
$10–15K	4.7%
$15–25K	4.4%
$25–35K	3.2%
$35–50K	4.3%
$50–75K	8.8%
$75–100K	9.4%
$100–150K	15.7%
$150–200K	13.5%
$200K+	31.6%

Age

% of all residents	Value
<10	7.1%
10–19	9.8%
20–24	16.5%
25–34	28.9%
35–44	11.9%
45–54	7.2%
55–64	7.2%
65–74	6.5%
75+	4.8%

Tenure

% of housing units	Value
Owned, with mortgage	19.2%
Owned outright	11.6%
Rented	63.2%
Vacant	5.9%

Type of building

% of housing units	Value
Detached house	8.9%
Townhome	6.6%
2–4 units	34.2%
5–19 units	26.6%
20+ units	23.6%
Mobile / other	0.0%

Businesses in 02139

1,118 business establishments with 57,246 employees (ZIP Codes Business Patterns 2023).

Professional, Scientific, and Technical Services: 352
Accommodation and Food Services: 158
Health Care and Social Assistance: 115
Other Services (except Public Administration): 95
Retail Trade: 74
Real Estate and Rental and Leasing: 56
Finance and Insurance: 41
Information: 38

EDDM carrier routes

02139 has 23 USPS carrier routes with 15,488 residential and 1,298 business mailboxes. Open the EDDM route map.

Carrier routes in 02139

02139 has 23 USPS carrier routes (23 city (C)) with 15,488 residential and 1,298 business mailboxes. Routes range from 290 homes (C009) to 964 homes (C033); the median route has 679 homes. The Census counted 16,012 households in 02139 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	3
500–749	14
750–999	6
1,000–1,499	0
1,500+	0

Best routes in 02139 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route C018 — USPS business mailboxes 213, 638 homes
Route C006 — USPS business mailboxes 163, 447 homes
Route C009 — USPS business mailboxes 160, 290 homes
Route C065 — USPS business mailboxes 90, 902 homes
Route C067 — USPS business mailboxes 90, 718 homes

Select these 5 routes on the route map

Every carrier route in 02139

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C001	City	797	58	$132,397	—	—	—
C002	City	760	9	$114,596	—	—	—
C004	City	474	56	$132,397	—	—	—
C005	City	914	46	$114,596	—	—	—
C006	City	447	163	$114,596	—	—	—
C009	City	290	160	$126,821	—	—	—
C010	City	635	16	$181,102	—	—	—
C011	City	665	28	$114,596	—	—	—
C016	City	707	67	$134,222	—	—	—
C017	City	685	67	$117,862	—	—	—
C018	City	638	213	$134,222	—	—	—
C019	City	701	21	$150,156	—	—	—
C020	City	526	5	$132,397	—	—	—
C024	City	679	18	$112,697	—	—	—
C026	City	723	1	$136,674	—	—	—
C028	City	669	13	$117,862	—	—	—
C029	City	501	26	$181,102	—	—	—
C030	City	655	5	$150,156	—	—	—
C031	City	902	30	$114,596	—	—	—
C033	City	964	62	$112,697	—	—	—
C036	City	536	54	$151,804	—	—	—
C065	City	902	90	$56,389	—	—	—
C067	City	718	90	$142,077	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 02139 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

02215 — Boston city, MA (1 mi)
02141 — Cambridge city, MA (1.1 mi)
02142 — Cambridge city, MA (1.1 mi)
02163 — Boston city, MA (1.2 mi)
02143 — Somerville city, MA (1.3 mi)
02134 — Boston city, MA (1.4 mi)
02116 — Boston city, MA (1.5 mi)
02199 — Boston city, MA (1.5 mi)

Areas that include 02139

Cambridge, MA ZIP codes — 5 ZIP codes
Middlesex County ZIP codes — 83 ZIP codes
Massachusetts ZIP code data

Where it ranks

Mail every home in 02139

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 02139, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 02139 in?: 02139 is a Cambridge, MA mailing address. By land area, 100% lies inside Cambridge.
What county is 02139 in?: 02139 is in Middlesex County.
What is the population of 02139?: About 40,033 people (±1,280), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 39,525.
What is the median household income in 02139?: $134,586 (±$8,697), compared with $103,960 for Massachusetts as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 02139?: 23 USPS carrier routes with 15,488 residential and 1,298 business mailboxes (16,786 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 02139?: The closest, measured center to center: 02215 (1 mi, Boston), 02141 (1.1 mi, Cambridge), 02142 (1.1 mi, Cambridge), 02163 (1.2 mi, Boston), 02143 (1.3 mi, Somerville) and 02134 (1.4 mi, Boston).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.