Watertown, Massachusetts
Watertown is a city in Middlesex County, Massachusetts, with 35,329 residents in 2020. It is in Massachusetts's 5th congressional district. It spans 2 state house districts. Its state senate district is Suffolk and Middlesex District.
County
| County | Share of residents |
|---|---|
| Middlesex County | 100% |
Congressional district
| Congressional district | Share of residents |
|---|---|
| Massachusetts's 5th congressional district (MA-05) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MA-05) | Katherine M. Clark (D) | 202-225-2836 | 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 (Suffolk and Middlesex District) | Will Brownsberger (Democratic) | 100% | |
| State Representative (29th Middlesex District) | Steve Owens (Democratic) | 66% | |
| State Representative (10th Middlesex District) | John Lawn (Democratic) | 34% |
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
- Watertown website: https://watertown-ma.gov
- Watertown laws: search for the Watertown, 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 |
|---|---|
| Suffolk and Middlesex District | 100% |
| State house district | Share of residents |
|---|---|
| 29th Middlesex District | 66% |
| 10th Middlesex District | 34% |
ZIP codes
Percentages mark ZIPs only partly in Watertown: the share of that ZIP's residents living in it.
Get this in your AI agent
Your agent can get Watertown'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:2573405")
Watertown 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.