ZIP code 57640: Lodgepole, SD
ZIP code 57640 is in Perkins County, South Dakota, outside any city or Census-designated place. It is in South Dakota's at-large congressional district. Its state senate district is State Senate District 28; its state house districts are State House District 28B (85%) and State House District 28A (15%).
See it on the mapAll of South Dakota
City and county
Outside any city or Census-designated place.
| County | Share of ZIP residents |
|---|---|
| Perkins County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Lodgepole township | 21% |
| Grand River township | 20% |
| North Perkins UT | 18% |
| Fredlund township | 16% |
| Cash township | 15% |
| Sidney township | 4.5% |
| Horse Creek township | 2.7% |
| Wilson township | 2.7% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| South Dakota's at-large congressional district (SD-AL) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (SD-AL) | Dusty Johnson (R) | 202-225-2801 | 100% |
| U.S. Senator | John Thune (R) | 202-224-2321 · contact form | statewide |
| U.S. Senator | Mike Rounds (R) | 202-224-5842 · contact form | statewide |
| State Senator (State Senate District 28) | Sam Marty (R) | 100% | |
| State Representative (State House District 28B) | Travis Ismay (R) | 85% | |
| State Representative (State House District 28A) | Jana Hunt (R) | 15% |
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Perkins County website: http://www.perkinscounty.org
- Perkins County laws: search for the Perkins County, South Dakota code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 28 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 28B | 85% |
| State House District 28A | 15% |
Voting precincts
2 voting precincts overlap ZIP 57640. Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
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:57640")
ZIP 57640 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.