The county seat of Mellette County, South Dakota, is White River. It lies in the Black Hills, Badlands & Lakes Region. The county population on July 1, 1999, was 2,043, a decrease of 94 over the 1990 census.
03/17 Coming to The White River area Sully County Fair Onida SD August9-12 kicking off the fair with a parade through Onida on Thursday, at 6:27 p.m. The parade will end up at the fairgrounds where we will be having cake, refreshments and music.