Adelphi, Maryland

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Adelphi, Maryland
Census-designated place
The Adelphi Mill in July 2007
The Adelphi Mill in July 2007
Location of Adelphi, Maryland
Location of Adelphi, Maryland
Coordinates: 38°59′49″N 76°58′0″W / 38.99694°N 76.96667°W / 38.99694; -76.96667Coordinates: 38°59′49″N 76°58′0″W / 38.99694°N 76.96667°W / 38.99694; -76.96667
Country  United States of America
State  Maryland
County Prince George's
 • Total 2.7 sq mi (7.1 km2)
 • Land 2.7 sq mi (7.1 km2)
 • Water 0.0 sq mi (0.0 km2)
Elevation 171 ft (52 m)
Population (2010)
 • Total 15,086
 • Density 5,500/sq mi (2,100/km2)
Time zone Eastern (EST) (UTC-5)
 • Summer (DST) EDT (UTC-4)
ZIP codes 20783, 20787
Area code(s) 301
FIPS code 24-00400
GNIS feature ID 0596997

Adelphi is an unincorporated area and census-designated place in Prince George's County, Maryland.[1] The population was 15,086 at the 2010 United States Census.[2] Adelphi includes the following subdivisions; Adelphi, Adelphi Park, Adelphi Hills, Adelphi Terrace, Adelphi Village, Buck Lodge, Chatham, Cool Spring Terrace, Hillandale Forest, Knollwood, Lewiston, and White Oak Manor.


The unincorporated Adelphi community takes its name from the historic Adelphi Mill, established in 1796 along the Northwest Branch of the Anacostia River. The Adelphi Mill is administered by the Maryland-National Capital Park and Planning Commission and continues to attract visitors and can be rented for special functions. During the 19th century, George Washington Riggs acquired much of the area northeast of Washington, D.C., as his Green Hill estate in the Chillum Manor district. That estate included present-day Adelphi. In the early 1920s, part of the area was acquired by Leander McCormick-Goodhart as part of his Langley Park estate.[3] Labor organizer Mary Harris "Mother" Jones died in 1930, at the farm of Walter and Lillie May Burgess near Powder Mill and Riggs Roads in present-day Adelphi. A marker was erected by the Maryland State Highway Administration commemorating Mother Jones at her death site. Unlike its nearby neighbors Hyattsville and College Park, the area remained relatively undeveloped until immediately following World War II. At that time, subdivisions quickly developed. To distinguish it from the other neighboring unincorporated communities of Lewisdale and Langley Park, the growing subdivisions banded together in the mid-1950s and adopted the name "Adelphi" to reflect their commitment to the preservation of the historic mill of the same name. These subdivisions now include Adelphi Park, Chatham, Cool Spring Terrace, Adelphi, Buck Lodge, White Oak Manor, Hillandale Forest, Knollwood, and Lewiston. A community focal point that originally developed in the late 1950s is the Adelphi Pool, a private pool in the Adelphi neighborhood, located next to George Washington Cemetery on Riggs Road. In order to swim at the Adelphi Pool, people are required to purchase a membership. Non-members of the Adelphi pool may swim, provided they are accompanied with a member. However, in order for non-members to enjoy this privilege, they must fork out a small fee. The Adelphi pool, like most other private swimming pools, does offer swimming lessons and also features swim teams which compete against each other. Two notable features about the Adelphi Pool, is that it features a long water slide, as well as a small basketball hoop.

In 1971, the Harry Diamond Laboratories was established on 137 acres (0.55 km2) in the northern part of Adelphi. That facility continues as the Adelphi Laboratory Center, Army Research Laboratory (ARL), the U.S. Army's corporate research laboratory.[4] Other adjacent federal facilities include the National Archives at College Park and headquarters of the Food and Drug Administration.

Historic sites[edit]

The following is a list of historic sites in Adelphi identified by the Maryland-National Capital Park and Planning Commission:[5]

Site name Image Location M-NCPPC Inventory Number Comment
1 Adelphi Mill and Storehouse
Adelphi Mill 1.jpg
8401 and 8402 Riggs Road 65-006
2 Cool Spring Farm (Miller’s House) 2201 Cool Spring Road 65-005
3 Gallant House 3124 Powder Mill Road 61-013


Adelphi is located at 38°59′49″N 76°58′0″W / 38.99694°N 76.96667°W / 38.99694; -76.96667 (38.996860, -76.966755).[6]

According to the United States Census Bureau, the CDP has a total area of 2.7 square miles (7.1 km2), all of it land.[7]

Bordering areas[edit]


As of 2000, there were 14,998 people, 5,332 households, and 3,321 families that were reported to be living in Adelphi, Maryland. The population density was 5,067.9 people per square mile (1,956.3/km²). There were 5,627 housing units at an average density of 1,901.4/sq mi (734.0/km²). The racial makeup of the CDP was 29.48% White, 39.83% African American, 0.28% Native American, 9.95% Asian, 0.06% Pacific Islander, 15.04% from other races, and 5.36% from two or more races. Hispanic or Latino of any race were 25.74% of the population.

There were 5,332 households out of which 30.6% had children under the age of 18 living with them, 42.5% were married couples living together, 13.5% had a female householder with no husband present, and 37.7% were non-families. 27.5% of all households were made up of individuals and 6.1% had someone living alone who was 65 years of age or older. The average household size was 2.77 and the average family size was 3.35.

In the CDP, the population was spread out with 22.7% under the age of 18, 13.0% from 18 to 24, 35.7% from 25 to 44, 19.1% from 45 to 64, and 9.5% who were 65 years of age or older. The median age was 32 years. For every 100 females there were 98.1 males. For every 100 females age 18 and over, there were 96.6 males.

The median income for a household in the CDP was $45,827, and the median income for a family was $53,839. Males had a median income of $32,495 versus $31,932 for females. The per capita income for the CDP was $20,952. About 6.6% of families and 9.0% of the population were below the poverty line, including 6.2% of those under age 18 and 7.4% of those age 65 or over.

Government and infrastructure[edit]

The University of Maryland System headquarters are in Adelphi.[8]


Adelphi is the home of the University of Maryland University College, and the community is located near the University of Maryland main campus in College Park.

Adelphi is served by the Prince George's County Public Schools system. In 2000, a new elementary school opened in the community dedicated to labor organizer Mary Harris "Mother" Jones.

Private and parochial schools in Adelphi include:


Adelphi Shopping Center, former home to the original Ledo Restaurant

The main shopping centers that serve the Adelphi neighborhood are the Adelphi Shopping Center, Adelphi Plaza, and Metzerott Plaza.

Adelphi Shopping Center[edit]

The Adelphi Shopping Center is located at the corner of University Boulevard and West Park Drive. From 1955 until July 25, 2010, the Adelphi Shopping Center was home to the original Ledo Restaurant, an Italian restaurant famous for its specialty pizzas. On July 25, 2010, the Original Ledo Restaurant closed its doors in the Adelphi Shopping Center and reopened its new location a few miles away in Downtown College Park. The restaurant has been and continues to be a long-time favorite of University of Maryland students/faculty as well as residents of the Adelphi and College Park communities. In the middle of 2011, the El Amate Texas Mexican restaurant/bar took over Ledo's former space in the Adelphi Shopping Center.

The Adelphi Shopping Center was also home to a Jumbo Food Store, which opened on October 1, 1958. The Jumbo Food Store was converted into a Shoppers Food Warehouse store in the late 1980s. In 1994, the Shoppers Food Warehouse in the Adelphi Shopping Center was damaged in a fire. The Shoppers Food Warehouse used the fire as an opportunity to modernize its interior. However, 17 years later, in Spring 2011, the Shoppers Food Warehouse closed its doors in the Adelphi Shopping Center. One year later in the middle of 2012, the MegaMart chain of Latino supermarkets opened a "MegaFarmer's Supermarket" in Shoppers' former location. MegaMart already had a store across the street at the Adelphi Plaza; this store remains open as well. The Adelphi Shopping Center is also home to a Loch Lomond bakery, Asian carryout restaurant, SunTrust Bank, Haircut 2000 barber shop, H&R Block, Cricket Wireless, and Advanced Auto Parts.

Adelphi Plaza[edit]

The Adelphi Plaza is another shopping center that serves the Adelphi neighborhood. It is just west of the Adelphi Shopping Center on the same side of University Boulevard. The Adelphi Plaza contains a MegaMart Supermarket, Sabor Latino restaurant, La Casa De La Musica, McDonald's, King Kong Chinese Restaurant, and a Shell gas station.

Metzerott Plaza[edit]

Metzerott Plaza is the third shopping center that serves the Adelphi neighborhood. It is located at the corner of Adelphi Road and Riggs Road. Metzerott Plaza consists of Bestway supermarket, Rite Aid Pharmacy, Golden Bull Restaurant, 7-Eleven Convenience Store, Bank of America Branch, Popeyes Fast Food Restaurant, Basil's Pizza Carryout Shop, SkyLake Laundromat, and Western Union. Metzerott Plaza has been anchored by a Safeway Food & Drug Store for more than thirty years until November 4, 2006, when it decided closed its doors and move its store to the nearby town of Hillandale, MD, located right across the Beltway. The Safeway Food & Drug Store decided to move to Hillandale so it could modernize and find a greater amount of space to expand its supermarket. Once, the Safeway Food & Drug Store moved to Hillandale, it renamed itself, "Safeway Food & Pharmacy", since the word, "Pharmacy", was a more modernized term than "Drug Store". A Bestway Latin American Supermarket has been operating in Safeway's former spot in Metzerott Plaza, ever since Safeway closed. The shopping center also previously contained a McDonald's Fast Food Restaurant and Bustin' Suds Laundromat. They closed a little earlier in the summer of 2006.

Notable people[edit]

See also[edit]

  • Avenel-Hillandale, name of a census-designated place in which the community was a part of in 1970.


  1. ^ U.S. Geological Survey Geographic Names Information System: Adelphi, Maryland
  2. ^ "Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data (DP-1): Adelphi CDP, Maryland". U.S. Census Bureau, American Factfinder. Archived from the original on September 11, 2013. Retrieved December 14, 2011. 
  3. ^ "Adelphi Mill Is Reopened to the Public," The Washington Post and Times Herald, Dec 6, 1954, pg. 21.
  4. ^ "Adelphi Laboratory Center". Entry for Adelphi Laboratory Center [Harry Diamond Laboratories], US Army Research Laboratory (ARL). 2008-04-15. 
  5. ^ M-NCPPC Illustrated Inventory of Historic Sites (Prince George's County, Maryland), 2006.
  6. ^ "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23. 
  7. ^ "Geographic Identifiers: 2010 Demographic Profile Data (G001): Adelphi CDP, Maryland". U.S. Census Bureau, American Factfinder. Archived from the original on September 11, 2013. Retrieved December 14, 2011. 
  8. ^ "Contact/Visit Us." University System of Maryland. Retrieved on September 18, 2012. "3300 Metzerott Road Adelphi, MD 20783" - See also Directions to USM Office

External links[edit]