ZIP code 02155: Medford, MA
ZIP code 02155 is in Medford (97% of residents) and Somerville (3.1%), in Middlesex County, Massachusetts. It is in Massachusetts's 5th congressional district (97%) and Massachusetts's 7th congressional district (3.1%). Its state senate district is Second Middlesex District; its state house districts are 35th Middlesex District (44%), 34th Middlesex District (37%), 23rd Middlesex District (17%) and 27th Middlesex District (2.2%).
See it on the mapAll of Massachusetts
City and county
| City or town | Share of ZIP residents |
|---|---|
| Medford | 97% |
| Somerville | 3.1% |
| County | Share of ZIP residents |
|---|---|
| Middlesex County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Medford city | 97% |
| Somerville city | 3.1% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Massachusetts's 5th congressional district (MA-05) | 97% |
| Massachusetts's 7th congressional district (MA-07) | 3.1% |
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.
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| Second Middlesex District | 100% |
| State house district | Share of ZIP residents |
|---|---|
| 35th Middlesex District | 44% |
| 34th Middlesex District | 37% |
| 23rd Middlesex District | 17% |
| 27th Middlesex District | 2.2% |
Voting precincts
18 voting precincts overlap ZIP 02155. 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:02155")
ZIP 02155 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.