Keystone, South Dakota
Keystone is a town in Pennington County, South Dakota, with 240 residents in 2020. It is in South Dakota's at-large congressional district. Its state senate district is State Senate District 30; its state house district is State House District 30.
County
| County | Share of residents |
|---|---|
| Pennington County | 100% |
Congressional district
| Congressional district | Share of 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 30) | Amber Hulse (R) | 100% | |
| State Representative (State House District 30) | Tim Goodwin (R) | 100% | |
| State Representative (State House District 30) | Trish Ladner (R) | 100% |
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
- Keystone laws: search for the Keystone, South Dakota code of ordinances
- Pennington County laws: search for the Pennington County, South Dakota code of ordinances
State legislative districts
| State senate district | Share of residents |
|---|---|
| State Senate District 30 | 100% |
| State house district | Share of residents |
|---|---|
| State House District 30 | 100% |
ZIP codes
Percentages mark ZIPs only partly in Keystone: the share of that ZIP's residents living in it.
- 57751 (33%)
Get this in your AI agent
Your agent can get Keystone's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:4633820")
Keystone here is the Census Bureau's place boundary as of January 1, 2025. Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.