Godfrey, IL has a population of 17,809 and is the 2,431st largest city in the United States. The population density is 511 per sq mi which is 130% higher than the Illinois average and 464% higher than the national average. The median age in Godfrey is 44 which is approximately 18% higher than the Illinois average of 37. In Godfrey, 63% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 72% of Godfrey residents were born in Illinois, 25% were born out of state, 1% were born outside of the United States and 2% were foreign born.