Wellington is a city in and the county seat of Sumner County, Kansas, United States. As of the 2020 census, the population of the city was 7,715. Wellington was platted in 1871 and named for the Duke of Wellington. It was designated as the Sumner County seat in 1872, winning out over Sumner City according to the Wellington library. Cattle herders coming up the Chisholm Trail helped to build the early town's economy.
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