Melvin, IL has a population of 550 and is the 18,981st largest city in the United States. The population density is 1,645 per sq mi which is 640% higher than the Illinois average and 1716% higher than the national average. The median age in Melvin is 38 which is approximately 2% higher than the Illinois average of 37. In Melvin, 64% of the population over 15 years of age are married, 94% speak English and 6% speak Spanish. 84% of Melvin residents were born in Illinois, 14% were born out of state, 1% were born outside of the United States and 2% were foreign born.