Alexis is a village in Mercer and Warren counties in Illinois, United States. The population was 831 at the 2010 census. The Warren County port…Alexis is a village in Mercer and Warren counties in Illinois, United States. The population was 831 at the 2010 census. The Warren County portion of Alexis is part of the Galesburg Micropolitan Statistical Area, while the Mercer County portion is part of the Davenport–Moline–Rock Island, IA-IL Metropolitan Statistical Area.
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