Vermillion is a city in Marshall County, Kansas, United States. As of the 2020 census, the population of the city was 76. Vermillion was found…Vermillion is a city in Marshall County, Kansas, United States. As of the 2020 census, the population of the city was 76. Vermillion was founded in 1869 by the Missouri Pacific Railroad. It was named from the Black Vermillion River.
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