Sully County, County in central South Dakota, United States.
Sully County spans 1,070 square miles of land and water, with rolling hills sloping toward the Missouri River along its western boundary line.
Established in 1873 and organized in 1883, the county received its name from General Alfred Sully, who constructed Fort Sully near the Missouri River.
Sully County maintains strong agricultural traditions with extensive farming operations spread across its semi-arid landscape and rolling prairie terrain.
The county seat of Onida houses the courthouse, which operates weekdays from 7:30 am to 4:30 pm with an hour lunch break at 11:30 am.
With only 1.4 inhabitants per square mile according to the 2020 census, Sully County ranks as the fifth least populated county in South Dakota.
Location: South Dakota
Inception: 1909
Capital city: Onida
Shares border with: Potter County, Hughes County, Hyde County, Stanley County, Dewey County
Website: http://sullycounty.net
GPS coordinates: 44.71000,-100.13000
Latest update: March 4, 2025 13:13
Lake Oahe
36 km
South Dakota Governor's Residence
41.9 km
South Dakota State Capitol
41.8 km
Pierre Shale
41.6 km
Fort Pierre Chouteau
41.3 km
Verendrye Site
44.1 km
Chicago and North Western Railroad Bridge
42 km
Hughes County Courthouse
41.8 km
I. W. Goodner House
40.8 km
Peter Hansen House
40.9 km
G.L. Stocker Blacksmith Shop
36.2 km
Farr House
41.5 km
Dr. William and Elizabeth Blackburn House
41.7 km
D.H. and Leah Curran House
36.3 km
Pierre Masonic Lodge
19.7 km
Brink-Wegner House
40.7 km
Sully County Courthouse
5.1 km
George Holland House
36.6 km
Potter County Courthouse
36.1 km
Karcher–Sahr House
41.6 km
L.E. Snyder House
5.2 km
John E. and Ruth Hipple House
41.7 km
Jefferson Davis Carr House
44.1 km
Crawford–Pettyjohn House
41.9 km
Horner–Hyde House
41.8 km
Methodist Episcopal Church
41.7 km
LaFramboise Island Nature Area
43.3 km
Okobojo Point Recreation Area
33.2 kmReviews
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