Trenton is the county seat and fourth largest city of Gibson County, Tennessee, United States. As of the 2020 census, the population was 4,240. Trenton was established in 1824 as a county seat for the newly created Gibson County. The site was initially home to a trading post known as "Gibson-Port" that was operated by Thomas Gibson, a brother of the county's namesake, Colonel John Gibson. The city is named for Trenton, New Jersey.
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