sentences:  Liberty was formed in 1843, Adams in 1848, then Jordan in 1850.Kent and Prairie were the last to be created, in 1864. , Prairie Township, at , has the lowest population density; it covers more area than any of the other townships—nearly —and contains no incorporated towns.The highest density is in Washington Township, which has ; it includes Williamsport, the county's largest town, and covers only about .