MERCER COUNTY POPULATION: 15,699 (2023 estimate) Mercer County has experienced a slight decline in population over the past decades, reflecting broader trends in rural Illinois counties. Key Cities and Villages Aledo (Population: 3,618) County Seat: Known as the hub of Mercer County, Aledo flourished with the arrival of the railroad in the 1850s. Cultural Significance: …
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The Forgottonia Project 