Named from the Mississinawa Creek, it is the only Mississinawa Township statewide. The first settler within the bounds of today's Mississinawa Township was Philip Reprogle, who arrived in 1833. Six years passed before the township's establishment in March 1839; it was created from a part of
Jackson Township. Its borders were later extended northward to include part of
Gibson Township when the rest of that township became part of
Mercer County. The first church in the township was a
Methodist congregation that was established in 1851, while the township's first school was founded at an unknown date. ==Government==