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Adelphi, MD

Frequently asked questions

Adelphi, MD

Adelphi is an unincorporated area and census-designated place in Prince George's County, Maryland, United States. Per the 2020 Census, the population was 16,823. Adelphi includes the following subdivisions; Adelphi, Adelphi Park, Adelphi Hills, Adelphi Terrace, Adelphi Village, Buck Lodge, Chatham, Cool Spring Terrace, Hillandale Forest, Holly Hill Manor, Knollwood, Lewisdale, 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. 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.

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. 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. Use of the Adelphi Pool requires paid membership or being accompanied by a member and paying a small fee. The Adelphi pool offers swimming lessons and also features swim teams that compete against each other. Two notable features of the Adelphi Pool are its long water slide and 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. Other adjacent federal facilities include the National Archives at College Park and the headquarters of the Food and Drug Administration.

Adelphi is located at 38°59′49″N 76°58′0″W (38.996860, −76.966755). According to the United States Census Bureau, the Census Designated Place (CDP) has a total area of 2.7 square miles (7.1 km²), all land.

Adelphi places a strong emphasis on health and wellness for its residents. The University of Maryland Medical Center offers comprehensive health services, including wellness check-ups and preventive care programs. For kickboxing, try Kickhouse and fuel your fitness fire. Start your fitness journey at LA Fitness, which provides a comprehensive gym experience with state-of-the-art equipment and group classes. For a more tailored approach, visit Planet Fitness known for its friendly and judgment-free environment. Engage in some outdoor fun at the Adelphi Mill and Recreation Center, where you can enjoy hiking, picnicking, and scenic views. Yoga enthusiasts can join classes at the Yoga Center of Columbia, offering a range of yoga styles for all levels. The Ellen Linson Splash Park is perfect for swimming laps and family fun. 

Top sites in Adelphi MD: University Hills Park, College Park Aviation Museum, Brookside Gardens.

Elevation: 171 ft (52 m). ZIP Code:171 ft (52 m). Area code: 301. Area: 2.72 sq mi (7.04 km²). Population: 16,823 (2020).

FAQs

What are the demographics of Adelphi, MD?

Adelphi is a city located in Montgomery County and Prince George's County Maryland. Adelphi has a 2024 population of 16,878. Adelphi is currently declining at a rate of -0.2% annually but its population has increased by 3.14% since the most recent census, which recorded a population of 16,364 in 2020. According to the most recent ACS, the racial composition of Adelphi was: Other race: 38.13%, Black or African American: 28.13%, White: 17.07%, Asian: 8.07%, Two or more races: 8.02%, Native American: 0.58%, Native Hawaiian or Pacific Islander: 0%.

What is the history of Adelphi, MD?

The unincorporated Adelphi community takes its name from the historic Adelphi Mill, established in 1796 along the Northwest Branch of the Anacostia River. 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.

What county is Adelphi, MD in?

Adelphi is an unincorporated area and census-designated place in Prince George's County, Maryland, United States. Per the 2020 Census, the population was 16,823. Adelphi includes the following subdivisions; Adelphi, Adelphi Park, Adelphi Hills, Adelphi Terrace, Adelphi Village, Buck Lodge, Chatham, Cool Spring Terrace, Hillandale Forest, Holly Hill Manor, Knollwood, Lewisdale, and White Oak Manor. According to the United States Census Bureau, the Census Designated Place (CDP) has a total area of 2.7 square miles (7.1 km²), all land.

Sources

Prince George's County

Wikipedia

World Population Review

University Hills Park

College Park Aviation Museum

Brookside Gardens

University of Maryland Medical Center

Kickhouse

LA Fitness

Planet Fitness

Adelphi Mill and Recreation Center

Yoga Center of Columbia

Ellen Linson Splash Park

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