| Ferney, South Dakota | |
| Settlement Type: | Census-designated place |
| Pushpin Map: | South Dakota#USA |
| Pushpin Label: | Ferney |
| Pushpin Map Caption: | Location within the state of South Dakota |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Dakota |
| Subdivision Type2: | County |
| Subdivision Name2: | Brown |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 2.60 |
| Area Land Km2: | 2.60 |
| Area Water Km2: | 0.00 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 42 |
| Population Density Km2: | 16.16 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 1299 |
| Coordinates: | 45.3344°N -98.0939°W |
| Postal Code Type: | ZIP codes |
| Postal Code: | 57439 |
| Area Code: | 605 |
| Blank Name: | FIPS code |
| Blank Info: | 46-21380 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1255039 |
| Area Total Sq Mi: | 1.00 |
| Area Land Sq Mi: | 1.00 |
| Area Water Sq Mi: | 0.00 |
| Population Density Sq Mi: | 41.87 |
Ferney is an unincorporated community and census-designated place in Brown County, South Dakota, United States. As of the 2020 census it had a population of 42.[3]
Ferney was laid out and platted in 1886 by W. H. Ferney, and named for him.[4] According to another tradition, the name is a transfer from Ferney, France.[5] A post office was established at Ferney in 1887, and remained in operation until it was discontinued in 1984.[6]