Wellston is a city in St. Louis County, Missouri, United States, along the northwest border of the city of St. Louis. The population was 2,313 a…Wellston is a city in St. Louis County, Missouri, United States, along the northwest border of the city of St. Louis. The population was 2,313 at the 2010 census. Wellston was incorporated as a city in 1909; due to "government difficulties" the city was dissolved three years later, only to be reestablished in 1949. The city was named for Erastus Wells.
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