ZIP code 02420: Lexington, MA
ZIP code 02420 is in Lexington, in Middlesex County, Massachusetts. It is in Massachusetts's 5th congressional district (100%) and Massachusetts's 6th congressional district (0.1%). Its state senate districts are Fourth Middlesex District (96%) and Third Middlesex District (4.0%); its state house districts are 15th Middlesex District (76%) and 21st Middlesex District (24%).
See it on the mapAll of Massachusetts
City and county
| City or town | Share of ZIP residents |
|---|---|
| Lexington | 100% |
| Burlington | 0.1% |
| County | Share of ZIP residents |
|---|---|
| Middlesex County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Lexington town | 100% |
| Burlington town | 0.1% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Massachusetts's 5th congressional district (MA-05) | 100% |
| Massachusetts's 6th congressional district (MA-06) | 0.1% |
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 |
|---|---|
| Fourth Middlesex District | 96% |
| Third Middlesex District | 4.0% |
| State house district | Share of ZIP residents |
|---|---|
| 15th Middlesex District | 76% |
| 21st Middlesex District | 24% |
Voting precincts
7 voting precincts overlap ZIP 02420. 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:02420")
ZIP 02420 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.