Boundary Atlas

ZIP code 57638: Lemmon, SD

ZIP code 57638 is in Lemmon (61% of residents), in Perkins County (84%), Adams County (12%), Corson County (2.4%), Sioux County (1.1%) and Grant County (1.0%), South Dakota. 39% of its residents live outside city limits. It is in South Dakota's at-large congressional district (86%) and North Dakota's at-large congressional district (14%). Its state senate districts are State Senate District 28 (86%), State Senate District 39 (12%) and State Senate District 31 (2.1%); its state house districts are State House District 28B (81%), State House District 39 (12%), State House District 28A (5.3%) and State House District 31 (2.1%).

1,901residents (2020 Census)
1,012.4 sq miland area
1cities and towns
2congressional districts
12voting precincts

See it on the mapAll of South Dakota

City and county

City or townShare of ZIP residents
Lemmon61%

CountyShare of ZIP residents
Perkins County84%
Adams County12%
Corson County2.4%
Sioux County1.1%
Grant County1.0%

Town or county subdivisionShare of ZIP residents
Lemmon city61%
East Adams UT7.5%
Lincoln township6.5%
Northeast Perkins UT4.5%
De Witt township2.4%
Lemmon UT2.1%
Flat Creek township1.4%
Beisigl township1.3%
Marshfield township1.3%
Gilstrap township1.2%
South Fork township1.2%
Liberty township1.1%
Menz township1.1%
White Butte township1.1%
West Grant UT1.0%
Trail township0.9%
Barrett township0.9%
Rockford township0.9%
Burdick township0.7%
Castle Butte UT0.6%
Orange township0.6%
Rolling Green township0.3%
Clark township0.3%
Clermont township0.1%
Pleasant Valley UT0.1%

Congressional districts

Congressional districtShare of ZIP residents
South Dakota's at-large congressional district (SD-AL)86%
North Dakota's at-large congressional district (ND-AL)14%

This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (SD-AL)Dusty Johnson (R)202-225-280186%
U.S. Representative (ND-AL)Julie Fedorchak (R)202-225-261114%
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 28)Sam Marty (R)86%
State Senator (State Senate District 39)Greg Kessel (R)12%
State Senator (State Senate District 31)Don Schaible (R)2.1%
State Representative (State House District 28B)Travis Ismay (R)81%
State Representative (State House District 39)Keith Kempenich (R)12%
State Representative (State House District 39)Mike Schatz (R)12%
State Representative (State House District 28A)Jana Hunt (R)5.3%
State Representative (State House District 31)Dawson Holle (R)2.1%
State Representative (State House District 31)Karen Rohr (R)2.1%

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 2886%
State Senate District 3912%
State Senate District 312.1%

State house districtShare of ZIP residents
State House District 28B81%
State House District 3912%
State House District 28A5.3%
State House District 312.1%

Voting precincts

12 voting precincts overlap ZIP 57638. It also crosses into ND. 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:57638")

ZIP 57638 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.