Sully County Courthouse  | |
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   Interactive map showing the location of Sully County Courthouse  | |
| Location | Main and Ash Sts., Onida, South Dakota | 
|---|---|
| Coordinates | 44°42′21″N100°03′56″W / 44.70583°N 100.06556°W | 
| Area | 1.5 acres (0.61 ha) | 
| Built | 1912 | 
| Architect | Black Hills Company | 
| Architectural style | Classical Revival | 
| MPS | County Courthouses of South Dakota MPS | 
| NRHP reference No. | 01000414 [1] | 
| Added to NRHP | April 25, 2001 | 
The Sully County Courthouse, at Main and Ash Sts. in Onida, South Dakota, was built in 1912. It was listed on the National Register of Historic Places in 2001. [1]
It is a three-story Classical Revival-style stone building with a cupola that serves as a clock tower. [2]
The building has an entablature with a dentil molding. It was designed by W. M. Rich of the Black Hills Company, a Deadwood architecture firm. [2]