Arkansas City, KS has a population of 12,198 and is the 3,374th largest city in the United States. The population density is 1,312 per sq mi which is 3640% higher than the Kansas average and 1348% higher than the national average. The median age in Arkansas City is 32 which is approximately 11% lower than the Kansas average of 36. In Arkansas City, 56% of the population over 15 years of age are married, 85% speak English and 13% speak Spanish. 61% of Arkansas City residents were born in Kansas, 31% were born out of state, 1% were born outside of the United States and 7% were foreign born.