[8] It was named for John Tyndall, an Irish physicist who had paid a visit to the United States.

[9] South Dakota Highway 50 serves the community and runs east–west on the southern end of town, and South Dakota Highway 37 is located just west of town.

According to the United States Census Bureau, the city has a total area of 1.58 square miles (4.09 km2), all land.

There were 531 housing units at an average density of 336.1 per square mile (129.8/km2).

39.9% of all households were made up of individuals, and 22.5% had someone living alone who was 65 years of age or older.

36.8% of all households were made up of individuals, and 20.8% had someone living alone who was 65 years of age or older.