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is a city in Sumner County, Kansas, United States. The population was 8,647 at the 2000 census. It is the county seat of Sumner County.
Wellington was first surveyed on April 4, 1871 and named for the Duke of Wellington. It was designated as the permanent seat of Sumner County in 1872, winning out over competitor Sumner City. Trading with the cattle herds coming up the Chisholm Trail was an important factor in the early economy of the town.