West Alton is a city in St. Charles County, Missouri, United States. The population was 359 at the 2020 census. It is located at the tip of the p…West Alton is a city in St. Charles County, Missouri, United States. The population was 359 at the 2020 census. It is located at the tip of the peninsula formed by the confluence of the Missouri and Mississippi Rivers and is directly across Alton, Illinois.
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