Polo, IL has a population of 2,131 and is the 10,649th largest city in the United States. The population density is 1,573 per sq mi which is 607% higher than the Illinois average and 1636% higher than the national average. The median age in Polo is 41 which is approximately 9% higher than the Illinois average of 37. In Polo, 56% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 85% of Polo residents were born in Illinois, 14% were born out of state, 0% were born outside of the United States and 0% were foreign born.