ZIP code 15857: St. Marys, PA

ZIP code 15857 is in St. Marys (99% of residents), in Elk County, Pennsylvania. It is in Pennsylvania's 15th congressional district. Its state senate district is State Senate District 25; its state house district is State House District 75.

12,906residents (2020 Census)

100.5 sq miland area

1cities and towns

1congressional district

11voting precincts

See it on the map All of Pennsylvania

City and county

City or town	Share of ZIP residents
St. Marys	99%

County	Share of ZIP residents
Elk County	100%

Town or county subdivision	Share of ZIP residents
St. Marys city	99%
Fox township	1.0%
Jay township	0.3%

Congressional district

Congressional district	Share of ZIP residents
Pennsylvania's 15th congressional district (PA-15)	100%

Elected officials

Office	Member	Contact	Share of residents
U.S. Representative (PA-15)	Glenn Thompson (R)	202-225-5121	100%
U.S. Senator	David McCormick (R)	202-224-6324 · contact form	statewide
U.S. Senator	John Fetterman (D)	202-224-4254 · contact form	statewide
State Senator (State Senate District 25)	Cris Dush (R)	814-646-7272	100%
State Representative (State House District 75)	Mike Armanini (R)	814-375-4688	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

St. Marys website: http://www.cityofstmarys.com/
St. Marys laws: search for the St. Marys, Pennsylvania code of ordinances
Elk County website: http://www.co.elk.pa.us
Elk County laws: search for the Elk County, Pennsylvania code of ordinances

State legislative districts

State senate district	Share of ZIP residents
State Senate District 25	100%

State house district	Share of ZIP residents
State House District 75	100%

Voting precincts

11 voting precincts overlap ZIP 15857. 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:15857")

ZIP 15857 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.