Keystone, South Dakota

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Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States. The population was 311 at the 2000 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.

Among its tourist attractions is the Black Hills Central Railroad, built in 1900 for Black Hills gold. It now operates passenger trains pulled by preserved steam locomotives.

Carrie Ingalls ("Little House on the Prairie") spent a significant part of her adult life there, living with her husband David N. Swanzey and his children. Her sister Mary Ingalls lived with them for a while and died here in 1928.


Keystone is located at 43°53′37″N 103°25′34″W / 43.893744°N 103.426080°W / 43.893744; -103.426080.[3]

According to the United States Census Bureau, the town has a total area of 2.9 square miles (7.4 km2), all of it land.

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


As of the census[1] of 2000, there were 311 people, 152 households, and 84 families residing in the town. The population density was 108.6 people per square mile (42.0/km2). There were 209 housing units at an average density of 73.0/sq mi (28.2/km2). The racial makeup of the town was 95.50% White, 1.93% Native American, 0.32% from other races, and 2.25% from two or more races. Hispanic or Latino of any race were 3.54% of the population.

There were 152 households out of which 27.0% had children under the age of 18 living with them, 37.5% were married couples living together, 12.5% had a female householder with no husband present, and 44.1% were non-families. 35.5% of all households were made up of individuals and 11.8% had someone living alone who was 65 years of age or older. The average household size was 2.05 and the average family size was 2.60.

In the town the population was spread out with 20.9% under the age of 18, 5.8% from 18 to 24, 30.9% from 25 to 44, 30.9% from 45 to 64, and 11.6% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 89.6 males. For every 100 females age 18 and over, there were 95.2 males.

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