Genealogy Trails


South Dakota

Sully County,

South Dakota

History and Genealogy


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Onida - county seat



Unorganized Areas

East Sully - West Sully


Sully County is 1,070 square miles.
Onida is the county seat.


Courthouse info:
Sully County Courthouse
Clerk of Courts
PO Box 188
Onida, SD 57564
(605) 258-2535
Fax: (605) 258-2270

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