Geneva, IL has a population of 21,732 and is the 2,006th largest city in the United States. The population density is 2,197 per sq mi which is 888% higher than the Illinois average and 2325% higher than the national average. The median age in Geneva is 44 which is approximately 18% higher than the Illinois average of 37. In Geneva, 67% of the population over 15 years of age are married, 94% speak English and 2% speak Spanish. 69% of Geneva residents were born in Illinois, 26% were born out of state, 1% were born outside of the United States and 4% were foreign born.