U.S. Economic Development Administration - 

SD Governor's Office of Economic Development - 

USDA Rural Development - 

SD Department of Environment and Natural Resources - 

SD Department of Transportation - 

SD Game Fish and Parks - 

just a few more links

South Dakota Housing Development Authority - 

SD Small Business Development Center - 

State of South Dakota - 

SD Association of County Commissioners - 

SD Municipal League - 

US Census Bureau -