Pleasant Hill, IL has a population of 1,217 and is the 13,941st largest city in the United States. The population density is 1,551 per sq mi which is 597% higher than the Illinois average and 1611% higher than the national average. The median age in Pleasant Hill is 35 which is approximately 7% lower than the Illinois average of 37. In Pleasant Hill, 54% of the population over 15 years of age are married, 96% speak English and 4% speak Spanish. 63% of Pleasant Hill residents were born in Illinois, 37% were born out of state, 0% were born outside of the United States and 0% were foreign born.