Dixon, IL has a population of 14,802 and is the 2,870th largest city in the United States. The population density is 1,997 per sq mi which is 798% higher than the Illinois average and 2104% higher than the national average. The median age in Dixon is 40 which is approximately 8% higher than the Illinois average of 37. In Dixon, 51% of the population over 15 years of age are married, 92% speak English and 5% speak Spanish. 78% of Dixon residents were born in Illinois, 17% were born out of state, 1% were born outside of the United States and 4% were foreign born.