278th Street in Iowa Township, South Dakota

278th Street in Douglas County is an unpaved residential street. It runs in an east-west direction and crosses 381st Avenue, 382nd Avenue, 383rd Avenue, 384th Avenue, 386th Avenue, 387th Avenue, 391 Street, 391st Avenue, US Highway 281 and 394th Avenue and ends at 396th Avenue, while the other end is a cul-de-sac. It connects Valley Township, Grandview Township and Iowa Township. 278th Street also exists in Lincoln Township.