National Visa Center (NVC)

A Department of State facility located in Portsmouth, New Hampshire.  It supports the worldwide operations of the Bureau of Consular Affairs Visa Office.  The NVC processes immigrant visa petitions from the Department of Homeland Security (DHS) for people who will apply for their immigrant visas at embassies and consulates abroad.  It also collects fees associated with immigrant visa processing.

Source: U.S. Department of State.