ZIP code 02139: Cambridge, MA
ZIP code 02139 is in Cambridge, in Middlesex County, Massachusetts. It is in Massachusetts's 7th congressional district (81%) and Massachusetts's 5th congressional district (19%). Its state senate district is Middlesex and Suffolk District; its state house districts are 26th Middlesex District (59%), 25th Middlesex District (27%), 18th Suffolk District (10%) and 2nd Suffolk District (4.0%).
See it on the mapAll of Massachusetts
City and county
| City or town | Share of ZIP residents |
|---|---|
| Cambridge | 100% |
| County | Share of ZIP residents |
|---|---|
| Middlesex County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Cambridge city | 100% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Massachusetts's 7th congressional district (MA-07) | 81% |
| Massachusetts's 5th congressional district (MA-05) | 19% |
This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MA-07) | Ayanna Pressley (D) | 202-225-5111 | 81% |
| U.S. Representative (MA-05) | Katherine M. Clark (D) | 202-225-2836 | 19% |
| U.S. Senator | Edward J. Markey (D) | 202-224-2742 · contact form | statewide |
| U.S. Senator | Elizabeth Warren (D) | 202-224-4543 · contact form | statewide |
| State Senator (Middlesex and Suffolk District) | Sal DiDomenico (Democratic) | 100% | |
| State Representative (26th Middlesex District) | Mike Connolly (Democratic) | 59% | |
| State Representative (25th Middlesex District) | Marjorie Decker (Democratic) | 27% | |
| State Representative (18th Suffolk District) | Mike Moran (Democratic) | 10% | |
| State Representative (2nd Suffolk District) | Danny Ryan (Democratic) | 4.0% |
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Cambridge website: https://www.cambridgema.gov/
- Cambridge council: Cambridge City Council
- Cambridge laws: search for the Cambridge, Massachusetts code of ordinances
- Middlesex County laws: search for the Middlesex County, Massachusetts code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| Middlesex and Suffolk District | 100% |
| State house district | Share of ZIP residents |
|---|---|
| 26th Middlesex District | 59% |
| 25th Middlesex District | 27% |
| 18th Suffolk District | 10% |
| 2nd Suffolk District | 4.0% |
Voting precincts
14 voting precincts overlap ZIP 02139. Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:02139")
ZIP 02139 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.