Upper Marlboro is a town in and the county seat of Prince George's County, Maryland, United States. The Town of Upper Marlboro is often mistaken for the unincorporated census-designated place of Greater Upper Marlboro Upper Marlboro is the county seat of Prince George's County, a large urban and suburban area of some 850,000 people adjacent to Washington, D.C. U.S. Route 301 and Maryland Route 4 intersect at the edge of town. Major features of the town include the courthouse, jail, county office building, board of education, and a lake with walking path. Just to the south of town is the Prince George's Equestrian Center which is the location of the annual county fair, a major annual antiques show and The Show Place Arena on the former Marlboro racetrack grounds. This arena is used for events such as hockey games, circuses, rodeos, conventions, trade shows, and graduation ceremonies of many regional high schools, as well as daily overflow parking for county governmental employees, jurors, and visitors.
Although the surrounding area has many rural, pastoral features, including horse farms, housing developments are increasingly prevalent. However, except for supermarkets, an Amish market, car dealers, and a Home Depot, all outside the town limits, the town and surrounding area have only minimal shopping; therefore, residents must travel to Bowie, Clinton, Brandywine, Waldorf, or Forestville to find department stores. Upper Marlboro is convenient to employees commuting to locations along Maryland Route 4 or US Route 301, such as Andrews Air Force Base and the U.S. Census Bureau.