Sanborn County South Dakota has 9 places on the National Register of Historic Places including 6 places of Statewide significance. Significant places include Site 39SB15, Site 39SB18, Site 39SB31, South Dakota Dept. of Transportation Bridge No. 56-090-096 and South Dakota Dept. of Transportation Bridge No. 56-117-123.
Prehistoric cultural affiliation(s) include Woodland dating back to 1000 BC.
Some of the country's most noteable architects helped create the Sanborn County places including Iowa Bridge Company, Stark, N.M. and & Co.. Prominent architectural styles found in Sanborn Country are Early Commercial and Late Gothic Revival.