Troy is a city in Lincoln County, Missouri, United States. As of 2019, the estimated population was 12,820. It is the county seat of Lincoln Cou…Troy is a city in Lincoln County, Missouri, United States. As of 2019, the estimated population was 12,820. It is the county seat of Lincoln County. Troy is an exurb of St. Louis, and is part of the St. Louis Metropolitan Statistical Area.
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