Litchfield, IL has a population of 6,976 and is the 5,191st largest city in the United States. The population density is 809 per sq mi which is 264% higher than the Illinois average and 793% higher than the national average. The median age in Litchfield is 43 which is approximately 16% higher than the Illinois average of 37. In Litchfield, 55% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 86% of Litchfield residents were born in Illinois, 13% were born out of state, 0% were born outside of the United States and 1% were foreign born.