Upper Marlboro, officially the Town of Upper Marlboro, is the county seat of Prince George's County, Maryland, United States. As of the 2020 census, the population within the town limits was 652, although Greater Upper Marlboro, which covers a large area outside the town limits, is many times larger.
AdSee the latest home listings for sale, connect with local experts and schedule the tour. Realtor.com® puts the best tools in your hands. Find your dream home in your favorite city