Boundary Atlas

ZIP code 57368: Plankinton, SD

ZIP code 57368 is in Plankinton (62% of residents), in Aurora County, South Dakota. 38% of its residents live outside city limits. It is in South Dakota's at-large congressional district. Its state senate district is State Senate District 21; its state house district is State House District 21.

1,270residents (2020 Census)
232.2 sq miland area
1cities and towns
1congressional district
5voting precincts

See it on the mapAll of South Dakota

City and county

City or townShare of ZIP residents
Plankinton62%

CountyShare of ZIP residents
Aurora County100%

Town or county subdivisionShare of ZIP residents
Plankinton city62%
Plankinton township15%
Hopper township4.6%
Palatine township4.2%
Firesteel township3.5%
Pleasant Lake township3.3%
Eureka township2.1%
Bristol township1.9%
Belford township1.7%
Dudley township1.5%
Cooper township0.8%
Crystal Lake townshipland only

Congressional district

Congressional districtShare of ZIP residents
South Dakota's at-large congressional district (SD-AL)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (SD-AL)Dusty Johnson (R)202-225-2801100%
U.S. SenatorJohn Thune (R)202-224-2321 · contact formstatewide
U.S. SenatorMike Rounds (R)202-224-5842 · contact formstatewide
State Senator (State Senate District 21)MyKala Voita (R)100%
State Representative (State House District 21)Jim Halverson (R)100%
State Representative (State House District 21)Marty Overweg (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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 21100%

State house districtShare of ZIP residents
State House District 21100%

Voting precincts

5 voting precincts overlap ZIP 57368. Map them, with each precinct's share of the ZIP's residents.

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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:

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ZIP 57368 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.