
Marysville
- County:
- St. Clair County
- County Seat:
- No
- Area (mi²):
- 7.328
- State:
- Michigan
Marysville is a city located in St. Clair County, Michigan. Marysville has a 2025 population of 9,868. Marysville is currently declining at a rate of -0.24% annually and its population has decreased by -1.22% since the most recent census, which recorded a population of 9,990 in 2020.
The average household income in Marysville is $86,739 with a poverty rate of 6.24%. The median age in Marysville is 43.6 years: 46.2 years for males, and 42 years for females.