| Feature Name: | Keystone
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| Feature Type: | ppl
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| State: | South Dakota
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| County: | Pennington
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| County Population: | 88565
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| County Housing Units: | 37249
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| County Size: | 2776.15 Square Miles
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| Latitude: | 43.89556
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| Longitude: | -103.41778
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| Elevation: | 4323
|
| Estimated Population: | 244
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| Map Cell Name: | Mount Rushmore
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| Geographic Keywords: | Keystone
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| Zip Codes: | 57751 zip code
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