Darby Township is one of the fifteen townships of Pickaway County, Ohio, United States. The 2000 census found 3,492 people in the township, 3,486 of whom lived in the unincorporated portions of the township.GeographyLocated in the northwestern corner of the county, it borders the following townships: Pleasant Township, Franklin County - northScioto Township - eastMuhlenberg Township - southeastMonroe Township - southPleasant Township, Madison County - westFairfield Township, Madison County - northwest Part of the village of Harrisburg is located in northern Darby Township, and the unincorporated community of Derby lies in the center of the township.Name and historyStatewide, other Darby Townships are located in Madison and Union Counties.Darby Township was settled chiefly by emigrants from Virginia.