Mosinee, WI has a population of 4,023 and is the 7,427th largest city in the United States. The population density is 512 per sq mi which is 486% higher than the Wisconsin average and 466% higher than the national average. The median age in Mosinee is 40 which is approximately 3% higher than the Wisconsin average of 39. In Mosinee, 60% of the population over 15 years of age are married, 97% speak English and 0% speak Spanish. 82% of Mosinee residents were born in Wisconsin, 16% were born out of state, 0% were born outside of the United States and 2% were foreign born.