Carthage is a city in and the county seat of Hancock County, Illinois, United States. Its population was 2,490 as of the 2020 census. Carth…Carthage is a city in and the county seat of Hancock County, Illinois, United States. Its population was 2,490 as of the 2020 census. Carthage is best known for being the site of the 1844 murder of Joseph Smith, who founded the Latter Day Saint movement.
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