Lincoln, IL has a population of 14,253 and is the 2,948th largest city in the United States. The population density is 2,228 per sq mi which is 902% higher than the Illinois average and 2359% higher than the national average. The median age in Lincoln is 38 which is approximately 2% higher than the Illinois average of 37. In Lincoln, 58% of the population over 15 years of age are married, 96% speak English and 2% speak Spanish. 81% of Lincoln residents were born in Illinois, 17% were born out of state, 1% were born outside of the United States and 1% were foreign born.