Prince George's County (often shortened to PG County) is a county located in the U.S. state of Maryland, bordering the eastern portion of Washington, D.C. As of the 2010 U.S. Census, the population was 863,420, making it the second-most populous county in Maryland, behind Montgomery County. Its county seat is Upper Marlboro. It is the largest and the most affluent African American-majority county in the United States, with five of its communities identified in a 2015 top ten list.Prince George's County is included in the Washington metropolitan area. The county also hosts many federal governmental facilities, such as Joint Base Andrews and the United States Census Bureau headquarters.

National Harbor is situated on the banks of the historic Potomac River, just minutes from the nation’s capital. Featuring 350 acres of waterfront resort space, National Harbor is a destination unlike any other.

Alexandria is an independent city in the Commonwealth of Virginia in the United States. As of 2010, the population was 139,988, and in 2020, the population was estimated to be at 159,200. The city's estimated population has grown by 1% percent annually since 2010 on average. Located along the western bank of the Potomac River, Alexandria is approximately 7 miles (11 km) south of downtown Washington, D.C. Like the rest of Northern Virginia, as well as Central Maryland, modern Alexandria has been influenced by its proximity to the U.S. capital. It is largely populated by professionals working in the federal civil service, in the U.S. military, or for one of the many private companies which contract to provide services to the federal government. One of Alexandria's largest employers is the U.S. Department of Defense. Another is the Institute for Defense Analyses. In 2005, the United States Patent and Trademark Office moved to Alexandria, and in 2017, so did the headquarters of the National Science Foundation. The historic center of Alexandria is known as Old Town. With its concentration of boutiques, restaurants, antique shops and theaters, it is a major draw for all who live in Alexandria as well for visitors. Like Old Town, many Alexandria neighborhoods are compact and walkable. It is the 7th largest and highest-income independent city in Virginia. A large portion of adjacent Fairfax County, mostly south but also west of the city, has Alexandria mailing addresses. However, this area is under the jurisdiction of Fairfax County's government and separate from the independent city. The city is therefore sometimes referred to as the "City of Alexandria" to avoid confusion (see the "Neighborhoods" paragraph below). Additionally, neighboring Arlington County was formerly named "Alexandria County" before it was renamed by the Virginia General Assembly in 1920 to reduce confusion with the city.

Maryland (MERR-ə-lənd) is a state in the Mid-Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware and the Atlantic Ocean to its east.