Janesville is a moderately sized city with a population of 61,310 located on the Rock River in the rolling hills, rich fields and verdant woodlands of scenic south central Wisconsin. Janesville is best known for its abundance of beautiful parks and recreational areas. Handy boat launches, numerous ball fields, playgrounds, two public golf courses, tennis courts, over 2,300 acres of parkland and 25+ miles of paved bike trail are just some of the amenities enjoyed by Janesville residents.