Map - Greenbelt, Maryland (Greenbelt)

Greenbelt is a city in Prince George's County, Maryland, United States, and a suburb of Washington, D.C. At the 2020 census, the population was 24,921.

Greenbelt is the first and the largest of the three experimental and controversial New Deal Greenbelt Towns, the others being Greenhills, Ohio, and Greendale, Wisconsin. Greenbelt was planned and built by the Federal government. The cooperative community was conceived in 1935 by Undersecretary of Agriculture Rexford Guy Tugwell, whose perceived collectivist ideology attracted opposition to the Greenbelt Towns project throughout its short duration. The project came into legal existence on April 8, 1935, when Congress passed the Emergency Relief Appropriation Act of 1935. Under the authority granted to him by this legislation, President Franklin D. Roosevelt issued an executive order, on May 1, 1935, establishing the United States Resettlement Administration (RA/RRA).

First called Maryland Special Project No. 1, the project was officially named Greenbelt when the Division of Suburban Resettlement of the Resettlement Administration began construction, on January 13, 1936, about eight miles north of Washington. The complete Greenbelt plans were reviewed at the White House by President Roosevelt and First Lady Eleanor Roosevelt on April 30, 1936. The first tenants, after selection in a stringent application process, moved in to the town on September 30, 1937. The construction consisted of structures built in the Art Deco, Streamline Moderne, and Bauhaus architectural styles.

Greenbelt is credited as a historic milestone in urban development because it was the initial model for the privately constructed suburban Washington, D.C., planned cities of Reston, Virginia, and Columbia, Maryland.

The original federally built core of the city, known locally as Old Greenbelt, was recognized as the Greenbelt Historic District by the Maryland Historical Trust, and is listed on the National Register of Historic Places as a National Historic Landmark District.

Greenbelt's population, which includes residents of privately built dwellings dating from after the end of the federal government's ownership of the city, was recorded as 23,068 at the 2010 U.S. Census and 24,921 at the 2020 census.

Greenbelt is located at °N, °W. According to United States Census Bureau data, as of January 1, 2018, the city has a total area of 16146235 m2, of which 16003389 m2 is land and 142846 m2 is water. Greenbelt's ZIP Codes are 20770, 20771, and 20768. The ZIP Code 20770 contains all residential and business addresses that correspond to actual physical locations inside the geographic boundaries of the City of Greenbelt. The 20768 ZIP Code is assigned exclusively to post-office box (P.O. Box) addresses, while 20771 is the designated ZIP Code for Goddard Space Flight Center, situated on federal government owned land that is contiguous with a portion of Greenbelt's eastern border.

NASA's Goddard Space Flight Center, located directly adjacent to Greenbelt's eastern boundary, utilizes a Greenbelt postal address (Greenbelt, MD 20768), as well. It is partially within the former Goddard census-designated place.

Greenbelt Park, a unit of the National Park System, is located within the City of Greenbelt's boundaries, at its southernmost portion.