Cedarville, IL has a population of 613 and is the 18,315th largest city in the United States. The population density is 1,361 per sq mi which is 512% higher than the Illinois average and 1402% higher than the national average. The median age in Cedarville is 54 which is approximately 43% higher than the Illinois average of 37. In Cedarville, 65% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 72% of Cedarville residents were born in Illinois, 27% were born out of state, 0% were born outside of the United States and 1% were foreign born.