Event Resource Guide by ProAdvance : Protocol: Order of Precedence

Chief Of Staff to the President
U.S. Representative to the United Nations
Director, Office of Management & Budget
Director of National Intelligence
Chairman, Council of Economic Advisors
U.S. Trade Representative
President Pro Tempore of the Senate
United States Senators (by seniority of Senate service; alphabetically when equal)
Governors when not in their own State (by State or alphabetically)
Acting heads of Cabinet level departments
Former Vice Presidents of the United States (in order of term, most recent last)
House of Representatives (by seniority of House service; alphabetically when equal)
Delegates to the House of Representatives from the District of Columbia, Guam, U.S. Virgin Islands, Puerto Rico, American Samoa
Governor of Puerto Rico
Counsellor and Assistants to the President and the Presidential Press Secretary
Charges D’Affaires of Foreign Powers
Former Secretaries of State
Deputy Secretaries and Under Secretaries (when Deputy Secretary equivalent) of the Executive Departments (the No. 2 position)
Solicitor General
Administrator, Agency for International Development
Director, U.S. Arms Control & Disarmament Agency
Director, U.S. Information Agency
Under Secretaries of the Executive Departments (Number three position in department)
U.S. Ambassadors-at-Large
Under Secretary of Defense for Acquisition (for acquisition matters only, (see normal position below)
Secretary of the Army
Secretary of the Navy
Secretary of the Air Force
Director, Office of Science & Technology Policy
Chairman, Board of Governors, Federal Reserve System
Chairman, Council on Environmental Quality
Chairman, Joint Chiefs of Staff
Under Secretary of Defense for Acquisition
Under Secretary of Defense for Policy
Retired Chairman, Joint Chiefs of Staff
Vice Chairman, Joint Chiefs of Staff
Chiefs of Staff of the Army & Air Force; Chief of Naval Operations; Commandant, Marine Corps (by date of appointment)
Retired Service Chiefs
Generals of the Army & Air Force; Fleet Admirals
Deputy Under Secretary of Defense for Acquisition
Secretary General, Organization of American States
Representatives to the Organization of American States
Heads of International Organizations (NATO, SEATO, etc)
Director, Central Intelligence Agency
Administrator, General Services Administration
Administrator, NASA
Chairman, Merit Systems Protection Board
Director, Office of Personnel Management
Administrator, Federal Aviation Administration
Chairman, Nuclear Regulatory Commission
Director of the Peace Corps
Administrator, Environmental Protection Agency

Special Assistants to the President
Governors of Guam & the U.S. Virgin Islands
Judges, U.S. Court of Appeals, Federal District
Judges, U.S. Court of Appeals, D.C. District
Cardinals
Deputy Administrator, Agency for International Development
Deputy Director, Arms Control & Disarmament Agency
U.S. Charges D’Affaires
Commandant, U.S. Coast Guard
Deputy Under Secretary of State
Director, Defense Research & Engineering
U.S. Ambassadors on official visits in D.C.
Assistant Secretaries of the Executive Departments, General Counsel, Inspector General (by date of appointment); Director, DOD Operational Testing & Evaluation; DOD Comptroller; Chief of Protocol, Department of State
U.S. Ambassadors on official visits in the U.S. outside the District of Columbia
Administrator, Nat’l Oceanographic (Atmospheric Admin.)
Deputy Director, Central Intelligence Agency
Deputy Director, General Services Administration
Deputy Director, U.S. Information Service
Deputy Director, NASA
Deputy Director, Office of Personnel Management
Deputy Director, Peace Corps
Deputy Director of Action
Assistant Administrator, Agency for International Development
Comptroller General of the U.S.
Deputy Assistants to the President
Judges, Court of Military Appeals
Members, Council of Economic Advisors
Active or Designate U.S. Ambassador & Ministers of career rank (when in the U.S.)
Archbishop
Mayor of the District of Columbia
Commissioners of the Trust Territories
Under Secretary of the Army
Under Secretary of the Navy
Under Secretary of the Air Force
Commanders-in-Chief, Unified/Specified Commands (by date of appointment)
Retired Commanders-in-Chief (4-Star Rank)
Vice Chiefs of Staff of the Army & Air Force; Vice Chief of Naval Operations; Asst Commandant of the Marine Corps (by appt date)
Assistant Secretaries of the Services (by date of appointment within each service) and Service General Counsels
Generals & Admirals (4-Star Rank)
Retired General & Admirals (4-Star Rank)
Director, Selective Service System
Special Assistant to the Secretary/Deputy Secretary of Defense
Executive Assistant to the Secretary of Defense
Executive Assistant to the Deputy Secretary of Defense
Assistants to the Secretary of Defense
Director, Administration & Management, OSD
Executive Secretary, Office of the Secretary of Defense

Directors, DLA, DMA, NSA, DCA; other DOD Agencies
Deputy Under Secretaries of Defense (by date of appointment); Deputy Director, Defense R&E; Director, Net Assess-ment
Administrative Assistants of the Army, Navy, Air Force
Lieutenant Generals & Vice Admirals
Retired Lieutenant Generals & Vice Admirals
Members, Defense Science Board
Chairman, American Red Cross
Bishops of Washington
Principal Deputy Assistant Secretaries of Defense; Principal Deputy Gen. Counsel, DOD (by date of appt)
Former U.S. Ambassadors/Ministers to Foreign Powers
Deputy U.S. Trade Representative
Civilian Aides to the Secretary of the Army
Heads of Independent Agencies; director, FBI; mayors
Treasurer of the U.S.
Director of The Mint
Chairman, Federal Communications Commission
Director, National Bureau of Standards
Librarian of Congress
Board of Governors, Federal Reserve System
Chairman, D.C. City Council
Commissioner, U.S. Customs Service
Commissioner, Internal Revenue Service
Principal Deputy Assistant Secretaries of the Services; Principal Deputy Gen. Counsels (by date of appointment)
Deputy Assistant Secretaries of Defense; Deputy Gen. Counsels, DOD (by date of appt); Advisor to the Deputy Secretary of Defense for NATO Affairs; Secretary of Defense Rep. to NST/ START; Assistant DOD Inspector General
Deputy Under Secretaries of the Services (by date of appointment within each service)
Members, Secretary of Defense Boards
Deputy Chief of Protocol, Department of State
Counselors of Foreign Powers
SES Members (PC 4); GS18; ST positions equivalent to PC45Major Generals & Rear Admirals (Upper Half)
Retired Major Generals & Rear Admirals (Upper Half)
Surgeon General of the U.S.
Deputy Assistant Service Secretaries & Deputy General Counsels (by date of appt within each service)
DOD Historian
Assistant Under Secretaries of Defense
SES Members (PC5); GS17; ST positions equal to PC56
Brigadier Generals & Rear Admirals (Lower Half)
Retired Brigadier Generals/Rear Admirals (Lower Half)
Assistant Chiefs of Protocol, Department of State
Secretary of the Senate
Doorkeeper of the House
Chaplain of the Senate
Assistant Deputy Under Secretaries of Defense and Principal Directors
SES Members (PC6); GS16; ST positions equal to PC6 7Colonels; Captains (USN); GS15; FO-1; FP-1

Counselors in Charge of Consulates of Foreign Powers
GS14
Lieutenant Colonels; Commanders; GS13; FO-2; FP-2
GS12
Majors; Lieutenant Commanders; FO-3; FP-3
GS11 Captains; Lieutenants (USN); GS10; FO-4; FP-4
First Lieutenants, Lieutenants (USN); GS9; FO-5, FP-5
GS8
Second Lieutenants; Ensigns; GS7; FP-7
Warrant Officers (by pay grade) Sergeant Major of the Army, Master Chief Petty Officer of the Navy; Chief Master Sergeant of the Air Force; Sergeant Major of the Marine Corps (by date of appointment)
Master Chief Petty Officer of the Coast Guard
Command Sergeants Major; Sergeants Major; Master Chief Petty Officers; Chief Master Sergeants; Master Gunnery Sergeants
Other Noncommissioned Officers by Rank

*The President of the United States can designate executive departments as Cabinet-level agencies, which moves their head into the Cabinet list.

Wikipedia publishes a copy of this list with many of the names attached to titles.
You can view that list here.