
Vermillion
- County:
- Marshall County
- County Seat:
- No
- Area (mi²):
- 0.208
- State:
- Kansas
Vermillion is a city located in Marshall County, Kansas. Vermillion has a 2025 population of 78. Vermillion is currently declining at a rate of 0% annually and its population has decreased by -2.5% since the most recent census, which recorded a population of 80 in 2020.
The average household income in Vermillion is $72,577 with a poverty rate of 17.54%. The median age in Vermillion is 44.3 years: 55.5 years for males, and 35.5 years for females.