Gann Valley County Treasurer's Office in Gann Valley South Dakota; Gann Valley County Treasurer's Office hours, address, appointments, phone number, holidays and services.

Gann Valley is the county seat of Buffalo County, as well as the center of population of South Dakota. Buffalo County Population: 1,912 (2010 census) The Buffalo County Courthouse is the headquarters of local government for the public. Auditor, Treasurer, Register of Deeds, Director of Equalization, and Sheriff offices are located in this building. Buffalo County Register of Deeds . Courthouse - 112 Osman Ave / PO Box 174, Gann Valley, South Dakota 57341-0174. 8:30 to 4:30 Monday through Friday Genealogy resources for Buffalo County, South Dakota. ... Buffalo County Resources. Register of Deeds: Yvette Isburg PO Box 174 Gann Valley SD 57341-0174 605-293-3239.