Department of Homeland Security

• US Citizenship and Immigration Services  
• USCIS District & Sub-Offices
• Service Center Case Status Search
• Forms on the USCIS Web Site
• Yearbook of Immigration Statistics

Department of State (DOS)

• Department of State, Bureau of Consular Affairs
• U.S. Missions and Consulates
• Visa Bulletin
• Visa Reciprocity Tables
• Forms on the DOS Website
• State Dept. Visa Waiting Times 
• DOS List of Foreign Terrorist Organizations Under the INA

Foreign Consulates (at infoplease.com)