Muddy, IL has a population of 32 and is the 28,575th largest city in the United States. The population density is 106 per sq mi which is 52% lower than the Illinois average and 17% higher than the national average. The median age in Muddy is 49 which is approximately 32% higher than the Illinois average of 37. In Muddy, 36% of the population over 15 years of age are married, 91% speak English and 9% speak Spanish. 44% of Muddy residents were born in Illinois, 47% were born out of state, 9% were born outside of the United States and 0% were foreign born.