Massachusetts Heights
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Massachusetts Heights, a small neighborhood in Northwest Washington, D.C., is predominantly occupied by Washington National Cathedral, its grounds, and its associated properties, including St. Albans School. A very small, triangular area contains the only residential section, adjacent to Observatory Circle and the Vice President’s Residence.

Notably, Observatory Circle is the grounds of the US Naval Observatory as well as the official residence of the vice president at Number One Observatory Circle. The USNO is one of the oldest scientific agencies in the United States, producing data for the US Navy and Department of Defense.