Located in Fairfax County, Virginia, United States, Greenbriar is a census-designated place (CDP). The population was 8,166 at the time of the 2010 census. The development of the town between Fairfax, VA city and Chantilly began in the late 1960s, when Levitt & Sons began developing the area.

The neighborhood is well-known for having only one road within its borders that does not begin with the letters “M” or “P,” which is Acorn Hill, which is the only road that does not begin with the letters “M” or “P.” It was added to the community in 1994 as a result of the installation of five mansions to the area. The roads were supposedly named after the architect’s two children, according to popular belief, however this has not been proved.

One disadvantage for residents of the community is that because nearly identical sounding named roads, such as Mayport and Maylock, are so close to each other and because house numbers are the same, the United States Postal Service, as well as UPS and FedEx, occasionally deliver items to the wrong address.

The subdivision has its own pool, although memberships are not accessible from the Pool Club, which is located in the neighborhood. Residents may instead opt to purchase their memberships from other members who are willing to sell their memberships to the community. Residents occasionally advertise such memberships for sale in the community publication Greenbriar Flyer, which is published twice a month.

The expense of maintaining the pool and employing employees, as well as staging swim meets for residents of neighboring areas in Fairfax County, is covered by the annual membership fee paid by each member. The Greenbriar Dolphins are the name given to the swimming teams at Greenbriar.

The civic association in Greenbriar, as opposed to most other communities, collects a strictly voluntary $25 annual donation from each homeowner. This money is used to fund events that the community hosts throughout the year, such as Bands in the Park, where local music groups perform for residents at Greenbriar Commons Park during the summer, and the publication of an annual community telephone directory.

There are no bylaws for residents in the Civic Association, which makes it a desirable and high-demand-market neighborhood to live in inside western Fairfax County, according to the Civic Association.

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