Boundary Atlas

ZIP code 57533: Gregory, SD

ZIP code 57533 is in Gregory (69% of residents), in Gregory County (96%), Lyman County (4.0%) and Tripp County (0.2%), South Dakota. 31% 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 21 (96%) and State Senate District 26 (4.0%); its state house districts are State House District 21 (96%) and State House District 26B (4.0%).

1,773residents (2020 Census)
376.9 sq miland area
1cities and towns
1congressional district
4voting precincts

See it on the mapAll of South Dakota

City and county

City or townShare of ZIP residents
Gregory69%

CountyShare of ZIP residents
Gregory County96%
Lyman County4.0%
Tripp County0.2%

Town or county subdivisionShare of ZIP residents
Gregory city69%
North Gregory UT12%
West Gregory UT8.1%
Iona township4.0%
Dixon township3.3%
Edens township2.3%
Jones township1.0%
Landing Creek township0.2%
Valley township0.2%

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)96%
State Senator (State Senate District 26)Tamara Grove (R)4.0%
State Representative (State House District 21)Jim Halverson (R)96%
State Representative (State House District 21)Marty Overweg (R)96%
State Representative (State House District 26B)Rebecca Reimer (R)4.0%

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 2196%
State Senate District 264.0%

State house districtShare of ZIP residents
State House District 2196%
State House District 26B4.0%

Voting precincts

4 voting precincts overlap ZIP 57533. 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:57533")

ZIP 57533 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.