Marion is a city in, and the county seat of, Marion County, Kansas, United States. As of the 2020 census, the population of the city was 1,922. T…Marion is a city in, and the county seat of, Marion County, Kansas, United States. As of the 2020 census, the population of the city was 1,922. The city was named in honor of Francis Marion, a brigadier general of the American Revolutionary War, known as the "Swamp Fox".
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