Pennington County
Pennington County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 109,222, making it the second most populous county in South Dakota, and was estimated to be 116,792 in 2025. Its county seat is Rapid City. The county was created on January 11, 1875, and was organized on April 19, 1877. It is named for John L. Pennington, fifth Governor of Dakota Territory, who held office in 1875 when the county was formed. Pennington County is included in the Rapid City metropolitan statistical area. It is also the location of Mount Rushmore.
Governance bodies
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Cities and towns 8
Townships 20
- Township of Ash pop. 23
- Township of Castle Butte pop. 32
- Township of Cedar Butte pop. 44
- Township of Conata pop. 9
- Township of Crooked Creek pop. 24
- Township of Fairview pop. 70
- Township of Flat Butte pop. 7
- Township of Huron pop. 36
- Township of Imlay pop. 10
- Township of Lake Creek pop. 41
- Township of Lake Flat pop. 29
- Township of Lake Hill pop. 41
- Township of Owanka pop. 33
- Township of Peno pop. 29
- Township of Quinn pop. 12
- Township of Rainy Creek/Cheyenne pop. 19
- Township of Scenic pop. 57
- Township of Shyne pop. 11
- Township of Sunnyside pop. 15
- Township of Wasta pop. 38
Reference data (Census of Governments 2022)
- Census ID (PID6)
- 134547
- FIPS state
- 46
- FIPS county
- 103
- FIPS place
- 99103
- Census record name
- COUNTY OF PENNINGTON
- Mailing address
- 315 SAINT JOSEPH ST, RAPID CITY 57701