ZIP code 02138: Cambridge, MA
ZIP code 02138 is in Cambridge, in Middlesex County, Massachusetts. It is in Massachusetts's 5th congressional district (96%) and Massachusetts's 7th congressional district (4.0%). Its state senate districts are Middlesex and Suffolk District (42%), Suffolk and Middlesex District (38%) and Second Middlesex District (20%); its state house districts are 25th Middlesex District (68%), 29th Middlesex District (32%) and 27th Middlesex District (0.4%).
See it on the mapAll of Massachusetts
City and county
| City or town | Share of ZIP residents |
|---|---|
| Cambridge | 100% |
| Somerville | 0.4% |
| County | Share of ZIP residents |
|---|---|
| Middlesex County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Cambridge city | 100% |
| Somerville city | 0.4% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Massachusetts's 5th congressional district (MA-05) | 96% |
| Massachusetts's 7th congressional district (MA-07) | 4.0% |
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.
Members of Congress
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MA-05) | Katherine M. Clark (D) | 202-225-2836 | 96% |
| U.S. Representative (MA-07) | Ayanna Pressley (D) | 202-225-5111 | 4.0% |
| 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 |
Members serving now (119th Congress, until January 3, 2027). Source: Members of Congress: the @unitedstates project, congress-legislators (CC0).
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| Middlesex and Suffolk District | 42% |
| Suffolk and Middlesex District | 38% |
| Second Middlesex District | 20% |
| State house district | Share of ZIP residents |
|---|---|
| 25th Middlesex District | 68% |
| 29th Middlesex District | 32% |
| 27th Middlesex District | 0.4% |
Voting precincts
14 voting precincts overlap ZIP 02138. 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:02138")
ZIP 02138 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.