The US Capitol Visitor Center (CVC) serves as the main entrance for visitors to the United States Capitol, providing resources and information to enhance the visitor experience. The Center offers guided tours of the Capitol building, allowing visitors to explore the historic rooms and learn about the legislative process.

The United States Capitol Police (USCP) is a federal law enforcement agency responsible for protecting the U.S. Capitol Building, members of Congress, and visitors to the Capitol complex.

The Congressional Budget Office (CBO) is the U.S. legislative branch agency that provides nonpartisan analyses of budgetary and economic issues to Congress. CBO publishes the Budget and Economic Outlook, projections of spending, revenues, deficits, and debt, cost estimates of legislation, and analytical reports.