Janesville is a larger medium-sized city located in the state of Wisconsin. With a population of 65,942 people and 18 constituent neighborhoods, Janesville is the tenth largest community in Wisconsin.

The overall education level of Janesville is somewhat higher than in the average US city of 21.84%: 26.20% of adults 25 and older in the city have at least a bachelor's degree.

The per capita income in Janesville in 2018 was $32,136, which is middle income relative to Wisconsin, and upper middle income relative to the rest of the US. This equates to an annual income of $128,544 for a family of four. However, Janesville contains both very wealthy and poor people as well.

Janesville is a somewhat ethnically-diverse city. The people who call Janesville home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Janesville residents report their race to be White, followed by Black or African-American. Important ancestries of people in Janesville include German, Irish, Norwegian, English, and Italian.

The most common language spoken in Janesville is English. Other important languages spoken here include Spanish and Polish.