American embassies and missions — this US State Department page links to every US embassy and consulate worldwide where the US maintains a diplomatic mission

United States visas — official information about US visa policy and procedures, including the visa application process, current requirements, and updates

International travel resources from the US State Department

Foreign consular offices in the United States — a State Department list of foreign consular offices in the United States and recognized consular officers

CIA fact book — searchable database of almost every country and territory, including maps, history, political makeup and more.