The different requirements for each type of K visa are:

K-1 VISA (FIANCÉS OF U.S. CITIZENS):

• The foreign national fiancé must be living outside of the U.S.;
• The U.S. citizen must first file a Petition for Alien Fiancé with the United States Citizenship and Immigration Services (USCIS) and have it approved before the foreign national fiancé may apply for a K visa;
• Both the U.S. citizen and the fiancé must remain unmarried until the arrival of the foreign national fiancé in the U.S.;
• The foreign national fiancé and U.S. citizen must have met personally at least once in the two years before the K visa petition was filed.

K-3 VISA (SPOUSES OF U.S. CITIZENS):

• The foreign national spouse must be living outside of the U.S.;
• The U.S. citizen spouse must first file a Petition for Alien Fiancé with the United States Citizenship and Immigration Services (USCIS) and have it approved;
• A Petition for Alien Relative for the benefit of the spouse must also have been filed, along with the Petition for Alien Fiancé;
• If the marriage occurred outside the U.S., the U.S. consulate in the country where the marriage occurred must have issued the K visa.

AND K-4 VISAS (CHILDREN OF U.S. CITIZENS' FIANCÉS & CHILDREN OF U.S. CITIZENS' SPOUSES)

• The children must be located outside of the U.S. and will accompany the K-1 or K-3 visa applicant or visa holder to the U.S.; and,
• The children must be under twenty-one (21) years of age and unmarried.