The 2016 Gardner, Kansas, population is 20,868. There are 2,052 people per square mile (population density).
The median age is 30.6. The US median is 37.4. 63.53% of people in Gardner, Kansas, are married. 10.75% are divorced.
The average household size is 2.86 people. 51.43% of people are married, with children. 15.90% have children, but are single.
84.35% of people are white, 3.39% are black, 2.25% are asian, 0.39% are native american, and 0.00% claim 'Other'.
7.33% of the people in Gardner, Kansas, claim hispanic ethnicity (meaning 92.67% are non-hispanic).
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