Gallatin County, is a county located in the northern part of the U.S. state of Kentucky. Its county seat is Warsaw. The county was founded in 1798 and named for Albert Gallatin, the Secretary of the Treasury under President Thomas Jefferson. Gallatin County is included in the Cincinnati-Middletown, OH-KY-IN Metropolitan Statistical Area. It is located alon…Gallatin County, is a county located in the northern part of the U.S. state of Kentucky. Its county seat is Warsaw. The county was founded in 1798 and named for Albert Gallatin, the Secretary of the Treasury under President Thomas Jefferson. Gallatin County is included in the Cincinnati-Middletown, OH-KY-IN Metropolitan Statistical Area. It is located along the Ohio River across from Indiana.