Carlinville, IL has a population of 5,297 and is the 6,208th largest city in the United States. The population density is 1,573 per sq mi which is 608% higher than the Illinois average and 1636% higher than the national average. The median age in Carlinville is 37 which is approximately 2% lower than the Illinois average of 37. In Carlinville, 54% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 83% of Carlinville residents were born in Illinois, 14% were born out of state, 1% were born outside of the United States and 1% were foreign born.