Boundary Atlas

ZIP code 04578: Wiscasset, ME

ZIP code 04578 is in Wiscasset (28% of residents), in Lincoln County, Maine. 72% of its residents live outside city limits. It is in Maine's 1st congressional district. Its state senate district is State Senate District 13; its state house districts are State House District 47 (84%) and State House District 48 (16%).

4,461residents (2020 Census)
33.4 sq miland area
1cities and towns
1congressional district
2voting precincts

See it on the mapAll of Maine

City and county

City or townShare of ZIP residents
Wiscasset28%

CountyShare of ZIP residents
Lincoln County100%

Town or county subdivisionShare of ZIP residents
Wiscasset town84%
Westport Island town16%

Congressional district

Congressional districtShare of ZIP residents
Maine's 1st congressional district (ME-01)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 13100%

State house districtShare of ZIP residents
State House District 4784%
State House District 4816%

Voting precincts

2 voting precincts overlap ZIP 04578. Map them, with each precinct's share of the ZIP's residents.

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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:04578")

ZIP 04578 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.