Pleasant Hill, IA has a population of 9,406 and is the 4,125th largest city in the United States. The population density is 1,042 per sq mi which is 1807% higher than the Iowa average and 1050% higher than the national average. The median age in Pleasant Hill is 38 which is approximately 1% lower than the Iowa average of 38. In Pleasant Hill, 65% of the population over 15 years of age are married, 93% speak English and 4% speak Spanish. 77% of Pleasant Hill residents were born in Iowa, 18% were born out of state, 0% were born outside of the United States and 4% were foreign born.