Chatham, Massachusetts
Chatham is a Census-designated place (an unincorporated community) in Barnstable County, Massachusetts, with 1,551 residents in 2020. It is in Massachusetts's 9th congressional district. Its state senate district is Cape and Islands District; its state house district is 4th Barnstable District.
County
| County | Share of residents |
|---|---|
| Barnstable County | 100% |
Congressional district
| Congressional district | Share of residents |
|---|---|
| Massachusetts's 9th congressional district (MA-09) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MA-09) | William R. Keating (D) | 202-225-3111 | 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 (Cape and Islands District) | Julian Cyr (Democratic) | 100% | |
| State Representative (4th Barnstable District) | Hadley Luddy (Democratic) | 100% |
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
- Chatham laws: search for the Chatham, Massachusetts code of ordinances
- Barnstable County website: http://www.barnstablecounty.org
- Barnstable County laws: search for the Barnstable County, Massachusetts code of ordinances
State legislative districts
| State senate district | Share of residents |
|---|---|
| Cape and Islands District | 100% |
| State house district | Share of residents |
|---|---|
| 4th Barnstable District | 100% |
ZIP codes
Percentages mark ZIPs only partly in Chatham: the share of that ZIP's residents living in it.
- 02633 (33%)
Get this in your AI agent
Your agent can get Chatham'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:2512960")
Chatham here is the Census Bureau's place boundary as of January 1, 2025 (a Census-designated place, which has no municipal government). Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.