Lennox is a city in Lincoln County, South Dakota, United States, located 20 miles (32 km) southwest of Sioux Falls.

[5] The city has the name of Ben Lennox, private secretary to the general manager to the Milwaukee Railroad.

[7] According to the United States Census Bureau, the city has a total area of 1.31 square miles (3.39 km2), all land.

There were 914 housing units at an average density of 697.7 per square mile (269.4/km2).

31.6% of all households were made up of individuals, and 14.2% had someone living alone who was 65 years of age or older.

31.9% of all households were made up of individuals, and 20.1% had someone living alone who was 65 years of age or older.