Fidelity, IL has a population of 161 and is the 25,373rd largest city in the United States. The population density is 1,468 per sq mi which is 560% higher than the Illinois average and 1521% higher than the national average. The median age in Fidelity is 26 which is approximately 29% lower than the Illinois average of 37. In Fidelity, 48% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 82% of Fidelity residents were born in Illinois, 18% were born out of state, 0% were born outside of the United States and 0% were foreign born.