Cuba, IL has a population of 1,399 and is the 13,102nd largest city in the United States. The population density is 2,576 per sq mi which is 1059% higher than the Illinois average and 2743% higher than the national average. The median age in Cuba is 37 which is approximately equal to the Illinois average of 37. In Cuba, 52% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 89% of Cuba residents were born in Illinois, 10% were born out of state, 1% were born outside of the United States and 0% were foreign born.