Boundary Atlas

South Dakota: cities, counties, ZIP codes and districts

South Dakota has 1 congressional district, 35 state senate districts and 37 state house districts under the maps in force for November 3, 2026, plus 818 voting precincts, 66 counties, 485 cities, towns and Census-designated places, and 377 ZIP codes.

Cities and towns

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

Congressional districts (2026)

DistrictShort2020 population
South Dakota's at-large congressional districtSD-AL886,667

ZIP codes in South Dakota

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 South Dakota. 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="SD")