Cissna Park, IL has a population of 826 and is the 16,373rd largest city in the United States. The population density is 1,185 per sq mi which is 433% higher than the Illinois average and 1208% higher than the national average. The median age in Cissna Park is 52 which is approximately 38% higher than the Illinois average of 37. In Cissna Park, 73% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 91% of Cissna Park residents were born in Illinois, 9% were born out of state, 0% were born outside of the United States and 0% were foreign born.