Woodstock, IL has a population of 25,232 and is the 1,713th largest city in the United States. The population density is 1,865 per sq mi which is 739% higher than the Illinois average and 1959% higher than the national average. The median age in Woodstock is 35 which is approximately 6% lower than the Illinois average of 37. In Woodstock, 54% of the population over 15 years of age are married, 76% speak English and 20% speak Spanish. 66% of Woodstock residents were born in Illinois, 18% were born out of state, 1% were born outside of the United States and 15% were foreign born.