There are four incorporated towns in the county. The largest is Williamsport, which is on the western banks of the Wabash River in the eastern part of the county, just downstream of Attica (which is on the east side of the river in Fountain County); in 2010, its population was 1,898—nearly one-fourth of the county's total. West Lebanon is about west of Williamsport on State Road 28, with a population of 723. The town of Pine Village lies about to the north of Williamsport where State Road 55 intersects State Road 26, near the northern edge of the county; 217 people live in Pine Village. State Line City is in the southwestern part of the county and shares its western border with the Illinois state line. A small Illinois community named Illiana lies immediately on the west side of the county road which runs along the state border (and which is also a street between the two communities). State Line City is the smallest of the towns, with a population of 143.