Hardtner, KS has a population of 166 and is the 25,241st largest city in the United States. The population density is 603 per sq mi which is 1620% higher than the Kansas average and 566% higher than the national average. The median age in Hardtner is 47 which is approximately 29% higher than the Kansas average of 36. In Hardtner, 65% of the population over 15 years of age are married, 98% speak English and 2% speak Spanish. 54% of Hardtner residents were born in Kansas, 45% were born out of state, 1% were born outside of the United States and 0% were foreign born.