McNabb, IL has a population of 305 and is the 22,420th largest city in the United States. The population density is 1,533 per sq mi which is 590% higher than the Illinois average and 1592% higher than the national average. The median age in McNabb is 37 which is approximately equal to the Illinois average of 37. In McNabb, 66% of the population over 15 years of age are married, 90% speak English and 4% speak Spanish. 80% of McNabb residents were born in Illinois, 15% were born out of state, 0% were born outside of the United States and 6% were foreign born.