In 2017, Sully County, SD had a population of 1.39k people with a median age of 44.9 and a median household income of $60,694. Between 2016 and 2017 the population of Sully County, SD declined from 1,456 to 1,390, a -4.53% decrease and its median household income grew from $59,800 to $60,694, a 1.49% increase.
The population of Sully County, SD is 95.5% White Alone, 2.09% Two or More Races, and 1.51% American Indian & Alaska Native Alone. N/A% of the people in Sully County, SD speak a non-English language, and 100% are U.S. citizens.
The median property value in Sully County, SD is $122,300, and the homeownership rate is 76.9%. Most people in Sully County, SD commute by Drove Alone, and the average commute time is 12.5 minutes. The average car ownership in Sully County, SD is 3 cars per household.