Stockton, IL has a population of 1,877 and is the 11,401st largest city in the United States. The population density is 1,083 per sq mi which is 387% higher than the Illinois average and 1095% higher than the national average. The median age in Stockton is 44 which is approximately 17% higher than the Illinois average of 37. In Stockton, 54% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 77% of Stockton residents were born in Illinois, 23% were born out of state, 0% were born outside of the United States and 0% were foreign born.