The U.S. Constitution (Article II, Section 2) provides for "executive departments" that answer (in writing) to the President. The chief executives (Secretaries) of these 15 departments, plus the Vice President and a handful of miscellaneous officials, compose the President's "Cabinet". The Cabinet Secretaries correspond roughly to Ministers under other government structures.

Cabinet Secretaries:
• Secretary of Agriculture (USDA)
• Secretary of Commerce (DoC)
• Secretary of Defense (DoD)
• Secretary of Education (ED)
• Secretary of Energy (DoE)
• Secretary of Health and Human Services (DHHS)
• Secretary of Homeland Security
• Secretary of Housing and Urban Development (HUD)
• Secretary of the Interior (DoI)
• Secretary of Justice (DoJ)
• Secretary of Labor (DoL)
• Secretary of State
• Secretary of Transportation (DoT)
• Secretary of Treasury
• Secretary of Veterans Affairs (VA)
  
  Other Cabinet offices:
• Vice President
• Environmental Protection Agency (EPA) Administrator
• Office of Management and Budget (OMB) Director
• United States Trade Representative (formally titled "Ambassador")
• Chief of Staff
• Office of National Drug Control Policy Director

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Special thanks to the "President Bush's Cabinet" page at http://www.whitehouse.gov/government/cabinet.html