Boundary Atlas

ZIP code 16623: Cassville, PA

ZIP code 16623 is in Cassville (28% of residents), in Huntingdon County, Pennsylvania. 72% of its residents live outside city limits. It is in Pennsylvania's 13th congressional district. Its state senate district is State Senate District 30; its state house district is State House District 81.

480residents (2020 Census)
11.1 sq miland area
1cities and towns
1congressional district
4voting precincts

See it on the mapAll of Pennsylvania

City and county

City or townShare of ZIP residents
Cassville28%

CountyShare of ZIP residents
Huntingdon County100%

Town or county subdivisionShare of ZIP residents
Cass township39%
Todd township30%
Cassville borough28%
Union township3.8%

Congressional district

Congressional districtShare of ZIP residents
Pennsylvania's 13th congressional district (PA-13)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 30100%

State house districtShare of ZIP residents
State House District 81100%

Voting precincts

4 voting precincts overlap ZIP 16623. 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:16623")

ZIP 16623 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.