Amboy, IL has a population of 2,519 and is the 9,799th largest city in the United States. The population density is 400 per sq mi which is 80% higher than the Illinois average and 342% higher than the national average. The median age in Amboy is 41 which is approximately 8% higher than the Illinois average of 37. In Amboy, 52% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 86% of Amboy residents were born in Illinois, 13% were born out of state, 0% were born outside of the United States and 2% were foreign born.