.US Domain Registration

.US .us is the Internet country code top-level domain (ccTLD) for the United States of America, established in 1985. Registrants of .us domains must be United States citizens, residents, or organizations, or a foreign entity with a presence in the United States. Most registrants in the country have registered for .com, .net, .org and other gTLDs, rather than .us, which has traditionally primarily been used by many state and local governments (although any entity had the option of registering a .us domain).
In particular, the domains .gov and .mil have been reserved for US usage, and .edu is mostly limited to US entities (although a small number of non-United States educational institutions have managed to register there).

.US Domain