Trenton is a city in Grundy County, Missouri, United States. The population was 5,609 at the 2020 census. It is the county seat of Grundy County…Trenton is a city in Grundy County, Missouri, United States. The population was 5,609 at the 2020 census. It is the county seat of Grundy County. The city used to be the world's largest producer of vienna sausages.
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