Boundary Atlas

ZIP code 17870: Selinsgrove, PA

ZIP code 17870 is in Selinsgrove (39% of residents), Hummels Wharf (9.1%) and Kratzerville (2.6%), in Snyder County (99%) and Union County (0.9%), Pennsylvania. 50% of its residents live outside city limits. It is in Pennsylvania's 15th congressional district. Its state senate districts are State Senate District 27 (99%) and State Senate District 23 (0.9%); its state house district is State House District 85.

14,730residents (2020 Census)
45.8 sq miland area
4cities and towns
1congressional district
12voting precincts

See it on the mapAll of Pennsylvania

City and county

City or townShare of ZIP residents
Selinsgrove39%
Hummels Wharf9.1%
Kratzerville2.6%
Kreamer0.2%

CountyShare of ZIP residents
Snyder County99%
Union County0.9%

Town or county subdivisionShare of ZIP residents
Selinsgrove borough39%
Penn township27%
Monroe township24%
Jackson township3.8%
Washington township3.1%
Union township1.3%
Middlecreek township1.1%
Union township0.9%

Congressional district

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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 2799%
State Senate District 230.9%

State house districtShare of ZIP residents
State House District 85100%

Voting precincts

12 voting precincts overlap ZIP 17870. 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:17870")

ZIP 17870 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.