The consular section of the United States Embassy in Phnom Penh processes applications for both nonimmigrant visas and immigrant visas to the United States.
Visitors to the United States require nonimmigrant visas. Before applying, you should know which type of visa that suits your purpose of travel. Please visit this website for information on how to apply for nonimmigrant visas.
All persons who plan to travel to the United States to establish permanent residency must obtain an immigrant visa prior to entering the United States. In general, in order to be eligible to apply for an immigrant visa, a foreign citizen must be sponsored by a U.S. citizen, an LPR relative, or a prospective employer.