Heidelberg is a city in Le Sueur County, Minnesota, United States.

[3] According to the United States Census Bureau, the city has a total area of 0.524 square miles (1.36 km2), all land.

[1] County Highway 28 serves as a main route in the community.

There were 47 housing units at an average density of 88.7 per square mile (34.2/km2).

12.2% of all households were made up of individuals, and 4.9% had someone living alone who was 65 years of age or older.