Dubuque, IA has a population of 58,535 and is the 677th largest city in the United States. The population density is 1,918 per sq mi which is 3411% higher than the Iowa average and 2017% higher than the national average. The median age in Dubuque is 37 which is approximately 2% lower than the Iowa average of 38. In Dubuque, 52% of the population over 15 years of age are married, 96% speak English and 1% speak Spanish. 69% of Dubuque residents were born in Iowa, 27% were born out of state, 0% were born outside of the United States and 3% were foreign born.