This is a list of notable companies headquartered in Northern Virginia. The majority of the following companies are located in Fairfax County and Loudoun County the most populous jurisdictions in Northern Virginia, Virginia state, and the Baltimore-Washington metropolitan area. Companies with a McLean or Vienna address are often located in Tysons Corner; "Tysons Corner" was not available as a postal address until 2011.
Government contracting companies (including defense contracting companies) may be involved in various fields, such as financial services, healthcare, information technology, mercenaries, science, and space technology, sometimes all within the same company. Some of the following companies may only derive a minority of their income from government contracting, but are listed here for organizational purposes.
Professional/trade organizations
These are companies based outside the U.S. with a division headquartered in Northern Virginia.
(Herndon)
(Arlington)
(McLean)
(Fredericksburg)
(Ashburn)
(Tysons) (Herndon) (Arlington)
(Arlington)
(Arlington) (Herndon) (McLean) (Reston)
(Sterling)
(Springfield) (Herndon)The following companies have major regional offices located in the Dulles Technology Corridor: