Bayside, WI has a population of 4,428 and is the 6,987th largest city in the United States. The population density is 1,854 per sq mi which is 2021% higher than the Wisconsin average and 1946% higher than the national average. The median age in Bayside is 47 which is approximately 20% higher than the Wisconsin average of 39. In Bayside, 75% of the population over 15 years of age are married, 86% speak English and 1% speak Spanish. 57% of Bayside residents were born in Wisconsin, 31% were born out of state, 1% were born outside of the United States and 11% were foreign born.