Galena, IL has a population of 3,402 and is the 8,184th largest city in the United States. The population density is 763 per sq mi which is 243% higher than the Illinois average and 742% higher than the national average. The median age in Galena is 43 which is approximately 14% higher than the Illinois average of 37. In Galena, 61% of the population over 15 years of age are married, 87% speak English and 11% speak Spanish. 54% of Galena residents were born in Illinois, 39% were born out of state, 0% were born outside of the United States and 7% were foreign born.