Boundary Atlas

Pennsylvania: cities, counties, ZIP codes and districts

Pennsylvania has 17 congressional districts, 50 state senate districts and 203 state house districts under the maps in force for November 3, 2026, plus 9,112 voting precincts, 67 counties, 2,003 cities, towns and Census-designated places, and 1,833 ZIP codes.

Cities and towns

Largest first. Each page lists the city's county, districts and ZIP codes.

Congressional districts (2026)

DistrictShort2020 population
Pennsylvania's 1st congressional districtPA-01764,866
Pennsylvania's 2nd congressional districtPA-02764,865
Pennsylvania's 3rd congressional districtPA-03764,864
Pennsylvania's 4th congressional districtPA-04764,865
Pennsylvania's 5th congressional districtPA-05764,866
Pennsylvania's 6th congressional districtPA-06764,864
Pennsylvania's 7th congressional districtPA-07764,865
Pennsylvania's 8th congressional districtPA-08764,866
Pennsylvania's 9th congressional districtPA-09764,864
Pennsylvania's 10th congressional districtPA-10764,864
Pennsylvania's 11th congressional districtPA-11764,864
Pennsylvania's 12th congressional districtPA-12764,864
Pennsylvania's 13th congressional districtPA-13764,864
Pennsylvania's 14th congressional districtPA-14764,866
Pennsylvania's 15th congressional districtPA-15764,864
Pennsylvania's 16th congressional districtPA-16764,865
Pennsylvania's 17th congressional districtPA-17764,864

ZIP codes in Pennsylvania

Each page lists the ZIP's congressional and legislative districts, with population shares where it's split.

Get this in your AI agent

Your agent can list, look up and map every district and precinct in Pennsylvania. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:

list_geographies(country="US", level="congressional_district", region="PA")