The town in the township with the largest population is Le Roy with 925 people.

Le Roy Township was organized on May 11, 1858[4] at a meeting held at the house of Daniel Caswell.

The township was named after Caswell's native home in Le Roy, New York/[5] Le Roy was a small village on the banks of the Little Iowa River, one of the small streams that eventually become the Upper Iowa River.

Henry Edmonds, the first citizen of "Old Town," erected a mill on the river in 1855.

When the railroad was being built about one mile to the southeast in the area that is the modern-day town of Le Roy, some of the settlers starting making plans.

When the first train rolled into "Le Roy Station" in August 1867, it dropped off building supplies for the new town.