Janesville is a city in Waseca County, Minnesota, United States.

[5] U.S. Highway 14 serves as a main route in the community, running east–west, south of Janesville.

There is one disabled stoplight, now a four way stop, in Janesville at the intersection of County Road 3 (Main Street) and old Highway 14.

[9] According to the United States Census Bureau, the city has a total area of 1.75 square miles (4.53 km2), all land.

There were 958 housing units at an average density of 547.4 per square mile (211.4/km2).

25.1% of all households were made up of individuals, and 10.4% had someone living alone who was 65 years of age or older.

25.5% of all households were made up of individuals, and 12.6% had someone living alone who was 65 years of age or older.