Keystone, South Dakota

Keystone, South Dakota
Town
Business district in Keystone
Motto: "Home Of Mount Rushmore"
Location in Pennington County and the state of South Dakota
Coordinates: 43°53′37″N 103°25′34″W / 43.89361°N 103.42611°W / 43.89361; -103.42611Coordinates: 43°53′37″N 103°25′34″W / 43.89361°N 103.42611°W / 43.89361; -103.42611
Country	United States
State	South Dakota
County	Pennington
Area
• Total	2.86 sq mi (7.41 km2)
• Land	2.86 sq mi (7.41 km2)
• Water	0 sq mi (0 km2)
Elevation	4,331 ft (1,320 m)
Population (2010)
• Total	337
• Estimate (2012)	342
• Density	117.8/sq mi (45.5/km2)
Time zone	Mountain (MST) (UTC-7)
• Summer (DST)	MDT (UTC-6)
ZIP code	57751
Area code(s)	605
FIPS code	46-33820
GNIS feature ID	1261912

Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States. The population was 337 at the 2010 census. 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 Mount Rushmore National Memorial, which is located just beyond city limits.

The town took its name from a local mine, which most likely was named after the keystone Masonic symbol.

Keystone is located at 43°53′37″N 103°25′34″W / 43.893744°N 103.426080°W / 43.893744; -103.426080.

According to the United States Census Bureau, the town has a total area of 2.86 square miles (7.41 km²), all of it land.

Keystone has been assigned the ZIP code 57751 and the FIPS place code 33820.

As of the census of 2010, there were 337 people, 153 households, and 81 families residing in the town. The population density was 117.8 inhabitants per square mile (45.5/km²). There were 230 housing units at an average density of 80.4 per square mile (31.0/km²). The racial makeup of the town was 93.8% White, 3.3% Native American, 0.6% Asian, 0.3% Pacific Islander, 0.3% from other races, and 1.8% from two or more races. Hispanic or Latino of any race were 8.3% of the population.