Boundary Atlas

ZIP code 57266: Summit, SD

ZIP code 57266 is in Summit (48% of residents), in Roberts County (59%) and Grant County (41%), South Dakota. 52% of its residents live outside city limits. It is in South Dakota's at-large congressional district. Its state senate districts are State Senate District 1 (59%) and State Senate District 4 (41%); its state house districts are State House District 1 (59%) and State House District 4 (41%).

599residents (2020 Census)
127.3 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
Summit48%

CountyShare of ZIP residents
Roberts County59%
Grant County41%

Town or county subdivisionShare of ZIP residents
Summit town48%
Blooming Valley township16%
Farmington township13%
Lura township6.7%
Ortley township5.3%
Mazeppa township5.2%
Summit township4.7%
Spring Grove township0.7%
Alto township0.5%

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 1)Michael Rohl (R)59%
State Senator (State Senate District 4)Stephanie Sauder (R)41%
State Representative (State House District 1)Logan Manhart (R)59%
State Representative (State House District 1)Nick Fosness (R)59%
State Representative (State House District 4)Dylan Jordan (R)41%
State Representative (State House District 4)Kent Roe (R)41%

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 159%
State Senate District 441%

State house districtShare of ZIP residents
State House District 159%
State House District 441%

Voting precincts

5 voting precincts overlap ZIP 57266. 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 57266 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.