Lake County South Dakota - Government Site
Population: 11,170
Area: 563 square miles
County Seat: Madison
Area Code(s) in use: 605
Time Zone: CST
Adjacent counties:
Brookings Kingsbury McCook Miner Minnehaha Moody
Airport
Madison Municipal Airport
Building
Nunda Township Hall
Cape
Bess Point, Fishers Point, Johnson Point, Walkers Point
Cemetery
Ash Grove Cemetery, Franklin Cemetery, Graceland Cemetery, Lake Park Cemetery, Olson Cemetery, Pleasant Hill Cemetery, Prairie Queen Cemetery, Prospect Cemetery, Rose Hill Cemetery, Saint Anns Cemetery, Saint Johns Lutheran Cemetery, Saint Thomas Cemetery, South Lake Campbell Cemetery, Toles Cemetery, West Lake Cemetery, Winfred Cemetery
Church
Ash Grove Church, Bethel Presbyterian Church (historical), Lake Madison Church, Saint Johns Church, Saint Peters Church
Civil
City of Madison, Lake County, Town of Nunda, Town of Ramona, Town of Winfred (historical), Township of Antelope (historical), Township of Badus, Township of Bartlett (historical), Township of Brant Lake (historical), Township of Chester, Township of Clarno, Township of Concord, Township of Farmington, Township of Franklin, Township of Herman, Township of Hyland (historical), Township of Lake Center (historical), Township of Lake View, Township of Le Roy, Township of Lincoln (historical), Township of Nunda, Township of Orland, Township of Rutland, Township of Summit, Township of Vermillion (historical), Township of Wayne, Township of Wentworth, Township of Wentworth (historical), Township of Winfred, Township of Winfred (historical), Village of Wentworth
Dam
Gutzman Dam
Gut
Crane Slough, Davis Slough, Dooley Slough, Quam Slough, Thompson Slough, Zimmerman Slough
Lake
Bourne Slough, Brant Lake, Buffalo Slough, Dry Lake, East Lake Badus, Gilman Lake, Green Lake, Herman Slough, Lake George, Lake Henry, Lake Herman, Lake Madison, Lake Winfred, Long Lake, Milwaukee Lake, Molumby Slough, Mud Lake, Pelican Lake, Round Lake, Spring Lake
Locale
Camp Lakodia, Chester (historical), Clarno (historical), Delmage (historical), Graceville Colony, Saranac (historical)
Park
Baughman Park, Buffalo Slough State Game Refuge, Lake Herman State Park, Saint Thomas Recreation Area, Wentworth Roadside Park
Populated Place
Chautauqua, Chester, Franklin, Junius, Madison, Nunda, Orland, Orland (historical), Peninsula Park, Prairie Queen (historical), Prairie Village, Ramona, Rutland, Smiths Park, Wentworth, Winfred
Post Office
Badus Post Office (historical), Egge Post Office (historical), Russell Post Office
Reservoir
Lake Badus
School
Central High School, Garfield School, General Beadle State College, Lincoln School, Saint Thomas School, Washington School
Stream
Buffalo Creek, Negro Creek, North Buffalo Creek, Park Creek, Silver Creek, Wolf Drain
Summit
Macey Hill
Swamp
Fods Slough, Reynolds Slough
Tower
KJAM-AM (Madison), KJAM-FM (Madison)
| Race | Population |
| White |  10,861 |
| American Indian | 116 |
| Asian | 101 |
| Mixed | 51 |
| Black | 40 |
| Hawaiian & Pacific Islander | 1 |
| Additional population tables : | |
| State population table | |
| South Dakota population by county | |