After the dam was built, Rupert became one of the first cities in the world to have its streets lit by electricity.

[citation needed] Rupert is located in southern Minidoka County at an elevation of 4,157 feet (1,267 m) above sea level.

Acequia lies about 5 miles (8 km) northeast of Rupert and Jackson is about 4 miles (6 km) east of Rupert on the Snake River of Minidoka County and Cassia County of Idaho and Paul is about the same distance to the west.

According to the United States Census Bureau, Rupert has a total area of 2.06 square miles (5.34 km2), all of it land.

[1] These data are from the Western Regional Climate Center, compiled over the years 1906 to 2002.

26.8% of all households were made up of individuals, and 14.2% had someone living alone who was 65 years of age or older.

25.2% of all households were made up of individuals, and 12.7% had someone living alone who was 65 years of age or older.

[12] The county is in the catchment area, but not the taxation zone, for College of Southern Idaho.