.us is the country code top-level domain name (ccTLD) for the United States.
.US domain extension ranks #24 among all domain extensions, and #16 among all country-code extensions (ccTLDs). Currently, there are 1.8 Million registered .us domain names. Neustar, Inc. is the registry of .us extension.
The oldest (still exists) .us domain name is 000domains.us, and it was registered on 18 April 2002.
The most popular .us domain name is zoom.us. Its worldwide rank is 16.
.US domains are most popular in United States. Romania and Canada are the other countries that have most .us domain registrations.