Sully County is located in the state of South Dakota. With a land mass of 1070 square miles, Sully County is one of the larger counties in the state, while in population it is at the bottom with 155 residents. Sully County's population density of rural makes it one of the most largely populated areas in the state. The county's largest city is Onida, with a population of 1,117.

Sully County is one of the more affluent regions in the state. The median income for Sully County residents is $33,530, putting the area in in the top half of all counties in South Dakota. As a reflection this, the average house price in Sully County is $48,239, on par with the state average of $72,289.    Continued below...