Camdenton is a city in and the county seat of Camden County, Missouri, United States. Its population was 3,718 at the 2010 census. The city i…Camdenton is a city in and the county seat of Camden County, Missouri, United States. Its population was 3,718 at the 2010 census. The city is enveloped by the Lower Niangua arm of the Lake of the Ozarks, and serves as a popular trade point for visitors to the area.