Webster City, IA has a population of 7,825 and is the 4,780th largest city in the United States. The population density is 883 per sq mi which is 1449% higher than the Iowa average and 874% higher than the national average. The median age in Webster City is 43 which is approximately 13% higher than the Iowa average of 38. In Webster City, 67% of the population over 15 years of age are married, 89% speak English and 7% speak Spanish. 75% of Webster City residents were born in Iowa, 18% were born out of state, 1% were born outside of the United States and 6% were foreign born.