The Town of Sumner was established in November of 1858. Its first meeting as a Town was on the first Tuesday in April of 1859. In its earliest years, Sumner was a bustling frontier community with a grist and flour mill, a saw mill, a harness shop and a blacksmith shop. While the early business disappeared due to changes in industrialization, a fair number of current residents are proud descendants of original settlers in the area.
The names of the Town roads reflect the names of early settlers: Kumlien, Klement, Hammerquist, and Bussey to name a few. Four lake side communities which started primarily as second homes in the 1920s and 1930s are now thriving communities with many permanent residents drawn to a quieter, more rural lifestyle.