Harrison Township was set off from Twin Township in 1815. The first elected officials began serving January 1, 1816. There were three trustees, a treasurer, clerk, an appraiser, three road supervisors, two constables, two overseers of the poor, two fence viewers, and two justices of the peace. Township officials were elected for only one year until 1886 when trustees were elected for three-year terms and the clerk for a two-year term. It was not until 1956 that the trustees and clerk were elected to four-year terms.