Marlborough, Massachusetts
Marlborough is a city in Middlesex County, Massachusetts, with 41,793 residents in 2020. It is in Massachusetts's 3rd congressional district. It spans 2 state house districts. Its state senate district is Middlesex and Worcester District.
County
| County | Share of residents |
|---|---|
| Middlesex County | 100% |
Congressional district
| Congressional district | Share of residents |
|---|---|
| Massachusetts's 3rd congressional district (MA-03) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MA-03) | Lori Trahan (D) | 202-225-3411 | 100% |
| 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 Worcester District) | Jamie Eldridge (Democratic) | 100% | |
| State Representative (4th Middlesex District) | Danielle Gregoire (Democratic) | 87% | |
| State Representative (13th Middlesex District) | Carmine Gentile (Democratic) | 13% |
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
- Marlborough website: http://www.marlborough-ma.gov/
- Marlborough laws: search for the Marlborough, Massachusetts code of ordinances
- Middlesex County laws: search for the Middlesex County, Massachusetts code of ordinances
State legislative districts
| State senate district | Share of residents |
|---|---|
| Middlesex and Worcester District | 100% |
| State house district | Share of residents |
|---|---|
| 4th Middlesex District | 87% |
| 13th Middlesex District | 13% |
ZIP codes
Percentages mark ZIPs only partly in Marlborough: the share of that ZIP's residents living in it.
Get this in your AI agent
Your agent can get Marlborough's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:2538715")
Marlborough here is the Census Bureau's place boundary as of January 1, 2025. Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.