Ludlow, IL has a population of 417 and is the 20,641st largest city in the United States. The population density is 1,049 per sq mi which is 372% higher than the Illinois average and 1058% higher than the national average. The median age in Ludlow is 29 which is approximately 21% lower than the Illinois average of 37. In Ludlow, 43% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 75% of Ludlow residents were born in Illinois, 22% were born out of state, 1% were born outside of the United States and 2% were foreign born.