householder with no husband present, and 27.4% were non-families. 24.4% of all households were made up of individuals, and 13.2% had someone living alone who was 65 years of age or older. The average household size was 2.45 and the average family size was 2.89. In the city, the population was spread out, with 23.7% under the age of 18, 6.8% from 18 to 24, 24.0% from 25 to 44, 23.4% from 45 to 64, and 22.2% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 85.7 males. For every 100 females age 18 and over, there were 79.9 males. The median income for a household in the city was $43,438, and the median income for a family was $49,688. Males had a median income of $31,442 versus $23,939 for females. The per capita income for the city was $18,643. About 1.9% of families and 3.1% of the population were below the poverty line, including 3.7% of those under age 18 and 0.8% of those age 65 or over. Notable people Robert H. "Three-Inch" Birch, a member of the "Banditti of the Prairie," accomplice in the 1845 torture-murder of Colonel George Davenport Charles C. Craig, jurist and politician Justina Ford, physician Armando Ghitalla, trumpet player with the Boston Symphony and Boston Pops Justin Hartley, actor known for roles on Passions, Smallville, and This Is Us James Knox, congressman Charles Wesley Leffingwell Episcopal priest, writer, and educator Ernest de Koven Leffingwell, explorer John E. Raker, politician James Knox Taylor, architect Charles R. Walgreen, founder of Walgreens Matt Wilson, world renowned jazz drummer Polly Wolfe, Major League Baseball outfielder References External links City of Knoxville Knox County Historical Sites Inc. Cities in Illinois Cities in Knox County, Illinois Galesburg, Illinois micropolitan area Populated places established in 1831