Morrison, IL has a population of 3,992 and is the 7,461st largest city in the United States. The population density is 1,572 per sq mi which is 607% higher than the Illinois average and 1635% higher than the national average. The median age in Morrison is 39 which is approximately 5% higher than the Illinois average of 37. In Morrison, 60% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 61% of Morrison residents were born in Illinois, 35% were born out of state, 1% were born outside of the United States and 3% were foreign born.