Boundary Atlas

ZIP code 03584: Lancaster, NH

ZIP code 03584 is in Lancaster (56% of residents), in Coos County, New Hampshire. 44% of its residents live outside city limits. It is in New Hampshire's 2nd congressional district. Its state senate district is State Senate District 1; its state house districts are State House District Coos 01 (100%) and State House District Coos 04 (0.1%).

3,490residents (2020 Census)
62.1 sq miland area
1cities and towns
1congressional district
3voting precincts

See it on the mapAll of New Hampshire

City and county

City or townShare of ZIP residents
Lancaster56%

CountyShare of ZIP residents
Coos County100%

Town or county subdivisionShare of ZIP residents
Lancaster town92%
Northumberland town7.6%
Jefferson town0.1%

Congressional district

Congressional districtShare of ZIP residents
New Hampshire's 2nd congressional district (NH-02)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (NH-02)Maggie Goodlander (D)202-225-5206100%
U.S. SenatorJeanne Shaheen (D)202-224-2841 · contact formstatewide
U.S. SenatorMargaret Wood Hassan (D)202-224-3324 · contact formstatewide
State Senator (State Senate District 1)David Rochefort (R)100%
State Representative (State House District Coos 01)James Tierney (R)100%
State Representative (State House District Coos 01)Sean Durkin (R)100%
State Representative (State House District Coos 04)Seth King (R)0.1%

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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 1100%

State house districtShare of ZIP residents
State House District Coos 01100%
State House District Coos 040.1%

Voting precincts

3 voting precincts overlap ZIP 03584. 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:03584")

ZIP 03584 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.