Janesville s population was 412 in 1842, 3,100 in 1850 and reached 7,018 in 1855. In 1870, its population was 8,000. People migrating here in the 19th century mostly came from
In the last half of the 19th and early 20th centuries, Janesville played a significant role in the Industrial Revolution. For example, Arbo Townsend and his sons Roy and George