The community that primarily supports the capital city of the United States, Washington, D.C., is the federal government. This support is multifaceted, encompassing economic, political, and administrative aspects. The federal government is the largest employer in the District of Columbia, with numerous agencies, departments, and offices located in the city. This concentration of government jobs creates a robust economy and a significant population base.

Data from the U.S. Bureau of Labor Statistics (BLS) indicate that the federal government employs over 200,000 workers in the Washington, D.C., metropolitan area. This figure accounts for approximately 20% of the total workforce in the region. The presence of these government employees generates a substantial economic impact, including the spending on salaries, services, and goods within the local economy.

Moreover, the federal government's influence extends beyond employment. It is responsible for the funding and maintenance of many of the city's infrastructure projects, such as public transportation, parks, and buildings. The National Mall, for instance, is a prime example of federal investment in the capital city's public spaces.

The political significance of Washington, D.C., as the nation's capital also contributes to its support. As the seat of the federal government, the city hosts numerous political events, conferences, and meetings, which attract visitors and further stimulate the local economy. The presence of the White House, Capitol, and Supreme Court, among other landmarks, makes Washington, D.C., a major tourist destination.

In summary, the federal government is the primary community that supports the capital city of the United States. This support is evident through the extensive employment opportunities, infrastructure investments, and political significance that the federal government brings to Washington, D.C.