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Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States.The population was 240 at the 2020 census. [5] It had its origins in 1883 as a mining town, and has since transformed itself into a resort town, serving the needs of the millions of visitors to the Mount Rushmore National Memorial, which is located just beyond the town limits.
This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Pennington County, South Dakota, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in a map.
Pennington County has a total area of 2,784 square miles (7,210 km 2), of which 2,777 square miles (7,190 km 2) is land and 7.7 square miles (20 km 2) (0.3%) is water. [10] It is the third-largest county in South Dakota by area, and is larger than the state of Delaware.
This route was originally part of SD 40. At that time, SD 40 exited the park to the northeast, and continued east with US 16. Around 1970, SD 40 was rerouted south from the park to a new alignment south of the White River. When this was done, SD 40A was created to link with US 16A. In 1976, this route was redesignated as South Dakota Highway 377.
Map of the United States with South Dakota highlighted Sioux Falls, most populous city in South Dakota Rapid City, ... Keystone: 241 240 +0.42%: Pennington:
The Keystone School, on 3rd St. in Keystone, South Dakota, was listed on the National Register of Historic Places in 1981. It is a large rural school built 1897-1900 by Eli Shomaker, with roof of wood shingles. [2] In 2018, it has been the Keystone Historical Museum for a number of years. [3]
The Lincoln Borglum Museum is located in the Mount Rushmore National Memorial near Keystone, South Dakota. It features two 125-seat theaters that show a 13-minute movie about Mount Rushmore. It features two 125-seat theaters that show a 13-minute movie about Mount Rushmore.
"Dakota Territory, South Dakota, and North Dakota: Individual County Chronologies". Dakota Territory Atlas of Historical County Boundaries. The Newberry Library. Archived from the original on November 11, 2007. Long, John H. (2006). "South Dakota: Consolidated Chronology of State and County Boundaries". South Dakota Atlas of Historical County ...