Prairie du Chien, WI has a population of 5,771 and is the 5,897th largest city in the United States. The population density is 988 per sq mi which is 1029% higher than the Wisconsin average and 990% higher than the national average. The median age in Prairie du Chien is 47 which is approximately 21% higher than the Wisconsin average of 39. In Prairie du Chien, 54% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 73% of Prairie du Chien residents were born in Wisconsin, 26% were born out of state, 0% were born outside of the United States and 0% were foreign born.