Immigrant Visa Categories
Immediate Relative Immigrant Visas (Unlimited Quota)
IR1/CR1 - Spouse of a U.S. Citizen
IR2 - Unmarried Child under 21 years of age of a U.S. Citizen
IR3 - Orphan adopted abroad by U.S. Citizen
IR4 - Orphan to be adopted in U.S. by U.S. Citizen
IR5 - Parent of U.S. Citizen who is at least 21 years old
IW - Spouse of deceased U.S. Citizen
K1 - Fiance(e) and minor children of U.S. Citizen
K3 - Certain spouses and minor children of U.S. Citizen

Family Preference Immigrant Visas (Limited Quota)
F1 - Unmarried Sons and Daughters of U.S. Citizens, and their minor children if any
F2A - Spouses and minor children of Legal Permanent Residents
F2B - Unmarried Sons and Daughters of Legal Permanent Residents (age 21 and over)
F3 - Married Sons and Daughters of U.S. citizens, and their spouses and children
F4 - Brothers and Sisters of U.S. Citizens, and their spouses and minor children, provided the U.S. citizens are at least 21 years of age. 

Employment-Based Immigrant Visas
E1 - Employment First Preference: Priority Workers (Persons w/Extraordinary Ability, Outstanding Professors and Researchers, and Multinational Managers or Executives)
E2 - Employment Second Preference: Professionals Holding Advanced Degrees and Persons of Exceptional Ability
E3 - Employment Third Preference: Skilled Workers, Professionals, and Unskilled Workers (Other Workers)
E4 - Employment Fourth Preference: Certain Special Immigrants
E5 - Employment Fifth Preference: Immigrant Investors

Special Immigrants
Iraqi or Afghan Translators / Interpreters
Iraqis - Worked for/on behalf of U.S. Government
Afghans - Worked for/on behalf of U.S. Government
Religious Workers
 
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