The 2010 United States Census found there were 35,251 people living in Leavenworth. They made up 12,256 households and 8,129 families. The population density was 1,466.2 people per square mile (566.1/km²). The people living in Leavenworth were 75.4% white, 15.1% African-American, 0.9% Native American, 1.8% Asian American, 0.2% Pacific Islander, 2.0% from other races, and 4.6% from more than one race.