Onalaska is a city located in Wisconsin. With a 2020 population of 19,483, it is the 42nd largest city in Wisconsin and the 1901st largest city in the United States. Onalaska is currently growing at a rate of 1.41% annually and its population has increased by 9.85% since the most recent census, which recorded a population of 17,736 in 2010. Onalaska reached it's highest population of 19,483 in 2021. Spanning over 11 miles, Onalaska has a population density of 1,901 people per square mile.
The average household income in Onalaska is $91,969 with a poverty rate of 6.70%. The median rental costs in recent years comes to $890 per month, and the median house value is $196,600. The median age in Onalaska is 40.6 years, 39.8 years for males, and 41.7 years for females. For every 100 females there are 87.1 males.