An Internet domain .us is an extension of great importance for companies that have businesses in the United States.

The requirements to register a .us domain are:

• US citizenship
• US residency
• Having established the organization or company in the US
• Organizations or companies incorporated outside the US with a branch in the United States of America.
• Organizations or companies incorporated outside the US with "Bona Fide Presence" [presence of good faith] in the United States to maintain legal relationships (purchase of goods or services or other business, commercial or noncommercial, including non-profit relationships.)
• In general, it is enough to have customers or suppliers in the US.