Eureka, South Dakota
Eureka is a city in McPherson County, South Dakota, with 813 residents in 2020. It is in South Dakota's at-large congressional district. Its state senate district is State Senate District 23; its state house district is State House District 23.
County
| County | Share of residents |
|---|---|
| McPherson 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 23) | Mark Lapka (R) | 100% | |
| State Representative (State House District 23) | Scott Moore (R) | 100% | |
| State Representative (State House District 23) | Spencer Gosch (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
- Eureka website: http://www.eurekasd.com/
- Eureka laws: search for the Eureka, South Dakota code of ordinances
- McPherson County website: http://mcpherson.sdcounties.org
- McPherson County laws: search for the McPherson County, South Dakota code of ordinances
State legislative districts
| State senate district | Share of residents |
|---|---|
| State Senate District 23 | 100% |
| State house district | Share of residents |
|---|---|
| State House District 23 | 100% |
ZIP codes
Percentages mark ZIPs only partly in Eureka: the share of that ZIP's residents living in it.
- 57437 (67%)
Get this in your AI agent
Your agent can get Eureka'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:4620180")
Eureka 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.