Boundary Atlas

ZIP code 57016: Chester, SD

ZIP code 57016 is in Chester (37% of residents), Brant Lake South (20%) and Brant Lake (8.1%), in Lake County, South Dakota. 34% 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 8; its state house district is State House District 8.

689residents (2020 Census)
26.5 sq miland area
3cities and towns
1congressional district
1voting precincts

See it on the mapAll of South Dakota

City and county

City or townShare of ZIP residents
Chester37%
Brant Lake South20%
Brant Lake8.1%

CountyShare of ZIP residents
Lake County100%

Town or county subdivisionShare of ZIP residents
Chester township86%
Brant Lake city8.1%
Franklin township6.1%

Congressional district

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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 8100%

State house districtShare of ZIP residents
State House District 8100%

Voting precincts

1 voting precinct overlap ZIP 57016. 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:57016")

ZIP 57016 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.