Boundary Atlas

Ohio: cities, counties, ZIP codes and districts

Ohio has 15 congressional districts, 33 state senate districts and 99 state house districts under the maps in force for November 3, 2026, plus 8,864 voting precincts, 88 counties, 1,265 cities, towns and Census-designated places, and 1,233 ZIP codes.

Cities and towns

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

Congressional districts (2026)

DistrictShort2020 population
Ohio's 1st congressional districtOH-01786,630
Ohio's 2nd congressional districtOH-02786,629
Ohio's 3rd congressional districtOH-03786,630
Ohio's 4th congressional districtOH-04786,630
Ohio's 5th congressional districtOH-05786,630
Ohio's 6th congressional districtOH-06786,630
Ohio's 7th congressional districtOH-07786,630
Ohio's 8th congressional districtOH-08786,630
Ohio's 9th congressional districtOH-09786,630
Ohio's 10th congressional districtOH-10786,629
Ohio's 11th congressional districtOH-11786,630
Ohio's 12th congressional districtOH-12786,630
Ohio's 13th congressional districtOH-13786,630
Ohio's 14th congressional districtOH-14786,630
Ohio's 15th congressional districtOH-15786,630

ZIP codes in Ohio

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 Ohio. 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="OH")