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- source: Getty Thesaurus of Geographic Names
- source: Family History Library Catalog
- the text in this section is copied from an article in Wikipedia
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. Its county seat is Rapid City. The county was created in 1875, and was organized in 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.
Timeline
Population History
- source: Source:Population of States and Counties of the United States: 1790-1990
| Census Year | Population
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| 1880 | 2,244
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| 1890 | 6,540
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| 1900 | 5,610
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| 1910 | 12,453
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| 1920 | 12,720
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| 1930 | 20,079
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| 1940 | 23,799
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| 1950 | 34,053
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| 1960 | 58,195
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| 1970 | 59,349
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| 1980 | 70,361
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| 1990 | 81,343
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