The State Archives currently has naturalization records from all South Dakota county courts.  Although these records are not available online, an index to these records is available online. You may also use the guide below to help determine which volumes you would like to search on your next visit to Pierre. 

Armstrong
Aurora
Beadle
Bennett
Bon Homme
Brookings
Brown
Brule
Buffalo
Butte
Campbell
Charles Mix

 Clark
Clay
Codington
Corson
Custer
Davison
Day
Deuel
Dewey
Douglas
Edmunds		 Fall River
Faulk
Grant
Gregory
Haakon
Hamlin
Hand
Hanson
Harding
Hughes
Hutchinson		 Hyde
Jackson
Jerauld
Jones
Kingsbury
Lake
Lawrence
Lincoln
Lyman
Marshall
McCook		 McPherson
Meade
Mellette
Miner
Minnehaha
Moody
Pennington
Perkins
Potter
Roberts
Sanborn		 Shannon
Spink
Stanley
Sully
Todd
Tripp
Turner
Union
Walworth
Yankton
Ziebach

Genealogy Resources available at the South Dakota State Archives

SD State Archives,  605-773-3804, fax 605-773-6041; email archref@state.sd.us