Clay County South Dakota - Government Site
Population: 12,867
Area: 412 square miles
County Seat: Vermillion
Area Code(s) in use: 605
Time Zone: CST
Adjacent counties:
Cedar (NE) Dixon (NE) Lincoln Turner Union Yankton
Airport
Harold Davidson Field
Bend
North Alabama Bend (historical)
Canal
Clay Creek Ditch, Flynn Dickerson Ditch, Yankton Clay Ditch
Cape
Mulberry Point (historical)
Cemetery
Bluff Center Cemetery (historical), Bluff View Cemetery, Clay Creek Cemetery, Clay Point Cemetery, Columkill Cemetery, Danefield Seventh Day Advent Cemetery, Dowlin Cemetery, Evergreen Cemetery, Fairview Cemetery, Houde Cemetery (historical), Hovde Cemetery, Lodi Cemetery, Meckling Cemetery, Mortvedt Cemetery, Pleasant Valley Cemetery, Riverside Cemetery, Rockfield Cemetery, Saint Johns Cemetery, Saint Patricks Cemetery, Saint Peters Cemetery, Saint Peters Cemetery, South Lodi Cemetery, Spirit Mound Cemetery, Taylor Cemetery, Union Cemetery
Church
Bergen Church, Bethel Scandinavian Baptist Church, Bloomingdale Methodist Church (historical), Dalesburg Church, Garfield Tabernacle, Komstad Church, Methodist Episcopal Church (historical), Saint Collumbkille Catholic Church (historical), Saint Paul Evangelical Lutheran Church (historical), Saint Peter Church, Seventh Day Adventist Church (historical), Trinity Church
Civil
City of Irene, City of Vermillion, Clay County, Town of Wakonda, Township of Bethel, Township of Fairview, Township of Garfield, Township of Glenwood, Township of Meckling, Township of Norway, Township of Pleasant Valley, Township of Prairie Center, Township of Riverside, Township of Spirit Mound, Township of Star, Township of Vermillion
Dam
Klostergaard Dam, Stewart Dam
Flat
Cabbage Flat
Lake
Burbank Lake, Lake Como (historical), Lake Emeline (historical), Lake Fargo (historical), Lake Montogomery, Lake Wakonda, Rose Lake
Locale
Alson (historical)
Park
Prentis Park
Populated Place
Bloomingdale, Bluff Center (historical), Burbank, Clay Point, Colfax Corner, Dalesburg, Glenwood (historical), Greenfield, Hub City, Irene, Komstad (historical), Lodi, Marshalltown (historical), Meckling, Riverside (historical), Saybrook (historical), Shaw (historical), Star Corner (historical), Vermillion, Wakonda, Westreville
Post Office
Bolton Post Office (historical)
School
Allard School, Ash Creek School (historical), Austin School, Bellview School (historical), Bethel School (historical), Bijou Ridge School (historical), Busy Bend School (historical), Center Point School, Circle Grove School (historical), Dalesburg School, Danefield School, Devine School Number 24 (historical), Elmwood School, Fairview School, Frog Creek School (historical), Glenwood School, Greenfield School, Harmony School (historical), Ireland School Number 54 (historical), Jolly Elementary School, Komstad School Number 46 (historical), Lincoln School, Marshalltown School (historical), Mount Pleasant School Number 32 (historical), Newdale School, North Riverside School (historical), Norway School, Pleasant Dell School (historical), Prairie Bell School, Prairie Center School, Saint Agnes School, Saint Patricks Catholic Church, Saybrook School, Shaw School (historical), Spring Hill School (historical), Star Corner School (historical), University of South Dakota, Valley School (historical), West Paint School (historical), Westerville School (historical)
Spring
Dillon Spring, Ellingson Spring (historical), Hagamon Spring (historical)
Stream
Ash Creek, Baptist Creek, Blind Creek, Frog Creek, Spirit Mound Creek, Spring Creek, Spring Creek, Vermillion River
Summit
Spirit Mound
Tower
KUSD-AM (Vermillion), KVRA-AM (Vermillion), KVRF-FM (Vermillion)
Valley
Norwegian Gulch
| Race | Population |
| White |  11,742 |
| American Indian | 426 |
| Asian | 382 |
| Mixed | 163 |
| Black | 152 |
| Hawaiian & Pacific Islander | 2 |
| Additional population tables : | |
| State population table | |
| South Dakota population by county | |