Marion is a town in and the county seat of Smyth County, Virginia, United States. It is positioned upon Interstate 81, in the Blue Ridge portion of the southern Appalachian Mountains in Southwest Virginia. The town is named for American Revolutionary War officer Francis Marion. Within the town limits it had a population of approximately 6,000, per 2020 Census counts. However, together with the neighborhoods, an additional 9,000 residents residing in unincorporated Smyth County have Marion mailing addresses, granting the Marion ZIP code (24354) a total population of about 14,500, which is approximately half of the county's total population.