Keokuk, IA has a population of 10,628 and is the 3,767th largest city in the United States. The population density is 1,164 per sq mi which is 2030% higher than the Iowa average and 1184% higher than the national average. The median age in Keokuk is 40 which is approximately 4% higher than the Iowa average of 38. In Keokuk, 54% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 70% of Keokuk residents were born in Iowa, 28% were born out of state, 0% were born outside of the United States and 2% were foreign born.