Catlin, IL has a population of 2,059 and is the 10,849th largest city in the United States. The population density is 2,464 per sq mi which is 1008% higher than the Illinois average and 2620% higher than the national average. The median age in Catlin is 37 which is approximately 1% lower than the Illinois average of 37. In Catlin, 62% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 85% of Catlin residents were born in Illinois, 15% were born out of state, 0% were born outside of the United States and 1% were foreign born.