Leavenworth is a city located in Kansas. With a 2020 population of 36,192, it is the 12th largest city in Kansas and the 1084th largest city in the United States. Leavenworth is currently growing at a rate of 0.18% annually and its population has increased by 2.67% since the most recent census, which recorded a population of 35,251 in 2010. Leavenworth reached it's highest population of 38,495 in 1990. Spanning over 24 miles, Leavenworth has a population density of 1,493 people per square mile.
The average household income in Leavenworth is $77,042 with a poverty rate of 14.67%. The median rental costs in recent years comes to $976 per month, and the median house value is $120,900. The median age in Leavenworth is 35.3 years, 35.3 years for males, and 35.4 years for females. For every 100 females there are 117.5 males.