Eastborough, KS has a population of 742 and is the 17,103rd largest city in the United States. The population density is 1,925 per sq mi which is 5389% higher than the Kansas average and 2025% higher than the national average. The median age in Eastborough is 46 which is approximately 28% higher than the Kansas average of 36. In Eastborough, 71% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 59% of Eastborough residents were born in Kansas, 39% were born out of state, 0% were born outside of the United States and 2% were foreign born.