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In page Friendly, Maryland:

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Friendly had its own rural post office in the early 20th century, and is now under the mailing address Fort Washington. The name "Friendly" is most associated with Friendly High School, which serves most of the greater Fort Washington area. The Friendly area was largely rural until about 1960 and has steadily grown with single-family housing developments. At least five new residential neighborhoods are currently under construction in the area.[citation needed] Allentown Road connects Friendly with Andrews Air Force Base.