Jefferson County, Kentucky was founded in 1780 and named for future president Thomas Jefferson, governor of Virginia at the time. As of the 2015 census, Jefferson’s population was 763,623. In 2003, its government merged with that of its largest city and county seat, Louisville, forming a new entity, the Louisville/Jefferson County Metro Government, or Louisville Metro. Whenever possible, the metro government generally avoids any self-reference including the name "Jefferson County" and has even renamed the Jefferson County Courthouse as “Metro Hall”.