The following list contains the major operational components that currently make up the Department of Homeland Security.

• www.dhs.gov - U.S. Department of Homeland Security
• www.cbp.gov - U.S. Customs and Border Protection
• www.fema.gov - Federal Emergency Management Agency
• www.fletc.gov - Federal Law Enforcement Training Center
• www.ice.gov - U.S. Immigration and Customs Enforcement
• www.secretservice.gov - U.S. Secret Service
• www.tsa.gov - Transportation Security Administration
• www.uscg.mil - U.S. Coast Guard
• www.uscis.gov - U.S. Citizenship and Immigration Services