Kill Creek Township was founded in 1872 when it was partitioned from Liberty Township. In 1880, the western half of Kill Creek Township became Mount Ayr Township. The rural farming community of Kill Creek, situated in the northern part of the township, was for a time a busy stop on the Bull City-Russell Freight Trail. An analysis of census records has shown that it suffered a steady decline in population over the years. Today, it has largely disappeared aside from a small number of residents who live in farmhouses spread throughout the township. The general store and post office are remembered only via a 1949 memorial marker where they once stood. The Kill Creek Presbyterian Church, built in 1885, was long the symbol of the community. It closed in 1985 and was torn down in 2006.