Scio Township is a civil township of Washtenaw County in the U.S. state of Michigan. The population was 17,552 at the 2020 census. Samuel W. Foster bought a mill site on the Huron River at what is now Scio in 1835. The community was platted by Dr. Cyril Nichols from Vermont. A post office was established in 1835. The office was moved to Delhi Mills a…Scio Township is a civil township of Washtenaw County in the U.S. state of Michigan. The population was 17,552 at the 2020 census. Samuel W. Foster bought a mill site on the Huron River at what is now Scio in 1835. The community was platted by Dr. Cyril Nichols from Vermont. A post office was established in 1835. The office was moved to Delhi Mills and renamed in February 1871, though the Scio office was re-established in September 1871. The post office took its name from the township; however, early township records were destroyed by fire, and it is uncertain why "Scio" was chosen. There are at least three origins suggested for the name. The first suggests it derives from the Greek island of Chios, and the second that it was named after Scio, New York, although that town was also named for Chios. Thirdly, by coincidence scio also means "I know" in Latin, so following the American Civil War some people assumed this was the origin of the name.