Lewistown is a borough located on the Juniata River, 61 miles northwest of Harrisburg in Mifflin County, Pennsylvania. The number of people living in 1900 was 4,451; in 1910, 8,166; and in 1940, 13,017. As of the 2000 census, the borough proper population was 8,998, although the surrounding townships and other boroughs push the population to 30,380. These combined municipalities are defined by the U.S. Census Bureau as the Lewistown Micropolitan Statistical Area, which locals simply refer to as Greater Lewistown. It is the county seat of Mifflin County, in a fertile farming region. Of the four cities in the US that share this name, Lewistown, Pennsylvania is the largest. Lewistown apartments for rent comparison page shows most up to date rent information on Lewistown apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.