Seat Pleasant is an incorporated city in Prince George's County, Maryland, United States, located immediately east of Washington. The population was 4,542 at the 2010 census. Two state highways pass through the community — Maryland routes 704 (now called Martin Luther King Jr. Highway and previously named George Palmer Highway in honor of banker and community leader George Palmer) and 214 (Central Avenue). The Washington Metro's Blue and Silver Lines are nearby. The Washington Football Team's stadium is east of Seat Pleasant, near the Capital Beltway (I-95/495).
Seat Pleasant is located on part of what had been the Williams-Berry estate. In 1850, the descendants of General Otho Holland Williams, a Revolutionary War hero, and James Berry, a mid-17th-century Puritan leader, sold it to Joseph Gregory. Seat Pleasant was developed on the dairy farm of Joseph Gregory, the farm of the Hill family, and the land of building contractor Francis Carmody, among others. In 1873, some of the land along Addison Road was subdivided into small farms and rural home sites known as Jackson's Subdivision.
Designers of the Chesapeake Beach Railway, constructed in 1897–99 between Washington, D.C. and Chesapeake Beach, Maryland, located their first station in Maryland outside Washington on the railway's right-of-way that traversed the Gregory property.