Milwaukee, WI has a population of 598,672 and is the 31st largest city in the United States. The population density is 6,225 per sq mi which is 7020% higher than the Wisconsin average and 6771% higher than the national average. The median age in Milwaukee is 31 which is approximately 21% lower than the Wisconsin average of 39. In Milwaukee, 36% of the population over 15 years of age are married, 81% speak English and 14% speak Spanish. 66% of Milwaukee residents were born in Wisconsin, 22% were born out of state, 2% were born outside of the United States and 10% were foreign born.