Greenup, IL has a population of 1,738 and is the 11,855th largest city in the United States. The population density is 995 per sq mi which is 336% higher than the Illinois average and 998% higher than the national average. The median age in Greenup is 40 which is approximately 7% higher than the Illinois average of 37. In Greenup, 48% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 86% of Greenup residents were born in Illinois, 13% were born out of state, 0% were born outside of the United States and 0% were foreign born.