Gardner is a city located in Johnson County Kansas. With a 2020 population of 22,441, it is the 18th largest city in Kansas and the 1698th largest city in the United States . Gardner is currently growing at a rate of 0.92% annually and its population has increased by 17.35% since the most recent census, which recorded a population of 19,123 in 2010. Gardner reached it's highest population of in . Spanning over 10 miles, Gardner has a population density of 2,181 people per square mile.
The average household income in Gardner is $84,169 with a poverty rate of 6.70%. The median rental costs in recent years comes to $1,066 per month, and the median house value is $189,100. The median age in Gardner is 32.3 years, 31.4 years for males, and 32.9 years for females.