Marysville
- County:
- Marshall County
- County Seat:
- Yes
- Area (mi²):
- 4.562
- State:
- Kansas
Marysville is a city located in Marshall County, Kansas. Marysville has a 2026 population of 3,422. It is also the county seat of Marshall County. Marysville is currently declining at a rate of -0.12% annually and its population has decreased by -0.75% since the most recent census, which recorded a population of 3,448 in 2020.