In 1900, 3,902 people lived in Kittanning, and in 1910, there were 4,311 people living in the area. After Wickboro became part of Kittanning, an estimated 10,000 people lived in Kittanning in 1914. In 1930, there were 7,808 people; in 1940, 7,550. The amount of people living in Kittanning was 4,787 at the 2000 census. Kittanning is the county seat of Armstrong County.