Aberdeen is a village in Brown County, Ohio, United States, along the Ohio River. The population was 1,638 at the 2010 census.Aberdeen is connected to Maysville, Kentucky by the Simon Kenton Memorial Bridge to downtown Maysville and the William H. Harsha Bridge, a cable-stayed bridge completed in 2001. It was part of Zane's Trace, a frontier road through the Northwest Territory completed in 1797.