http://en.wikipedia.org/wiki/State_funerals_in_the_United_States#Li...

Lying in state and honor recipients

Since the death of Henry Clay in 1852, the United States Capitol rotunda has served as the venue for honoring 31 military officers and politicians, including 11 presidents, with a lying in state. Not all who lie in state nor all for whom flags are flown at half-staff, receive a state funeral. In addition, the rotunda has been used for those who have lain in honor, the first in 1998 for the two victims of the Capitol shooting incident and again in 2005 for civil rights activist Rosa Parks.

The difference between lying in state and lying in honor is the designated guards of honor that keeps watch over the remains. When lying in state, five guards of honor, each representing the five branches of the Armed Forces, will periodically rotate and relieve the preceding set of guards of honor who watch over the remains. For recipients who have been designated to lie in honor, the United States Capitol Police will act as civilian guards of honor. No law, written rule, or regulation specifies who may lie in state. Use of the Capitol rotunda is controlled by a concurrent resolution of the House of Representatives and the Senate. Any person who has rendered distinguished service to the nation may lie in state if the family so wishes and the United States Congress approves. In the case of unknown soldiers, the president or the appropriate branch of the Armed Forces initiates the action.

People to have lain in state in the United States Capitol rotunda are as follows:

• Henry Clay (July 1, 1852)
• Abraham Lincoln (April 19–21, 1865)
• Thaddeus Stevens (August 13–14, 1868)
• Charles Sumner (March 13, 1874)
• Henry Wilson (November 25–26, 1875)
• James A. Garfield (September 21–23, 1881)
• John Alexander Logan (December 30–31, 1886)
• William McKinley (September 17, 1901)
• Pierre Charles L'Enfant (April 28, 1909)
• George Dewey (January 20, 1917)
• Unknown Soldier of World War I (November 9–11, 1921)
• Warren Harding (August 8, 1923)
• William Howard Taft (March 11, 1930)
• John Joseph Pershing (July 18–19, 1948)
• Robert Alphonso Taft (August 2–3, 1953)
• Unknown Soldiers of World War II and the Korean War (May 28–30, 1958)
• John F. Kennedy (November 24–25, 1963)
• Douglas MacArthur (April 8–9, 1964)
• Herbert Hoover (October 23–25, 1964)
• Dwight D. Eisenhower (March 30–31, 1969)
• Everett McKinley Dirksen (September 9–10, 1969)
• J. Edgar Hoover (May 3–4, 1972)
• Lyndon B. Johnson (January 24–25, 1973)
• Hubert Humphrey (January 14–15, 1978)
• Unknown Soldier of the Vietnam War, later identified as Michael J. Blassie (May 25–28, 1984)
• Claude Denson Pepper (June 1–2, 1989)
• Ronald Reagan (June 9–11, 2004)
• Gerald Ford (December 30, 2006 – January 2, 2007)
• Daniel Inouye (December 20, 2012)
• John McCain (August 31, 2018)
• George H.W. Bush (December 3–5, 2018)

People to have lain in honor in the United States Capitol rotunda are as follows:

• Jacob Chestnut and John Gibson (July 28, 1998)
• Rosa Parks (October 30–31, 2005)
• Billy Graham (February 28 – March 1, 2018)

People to have lain in state in the Herbert C. Hoover Building are as follows:

• Ronald H. Brown (April 9–10, 1996)

Supreme Court Justices to have lain in state in the Supreme Court Room at the United States Capitol are as follows:

• Salmon P. Chase (May 11, 1873)

Supreme Court Justices to have lain in state in the Great Hall at the United States Supreme Court Building are as follows:

• Earl Warren (July 11–12, 1974)
• Thurgood Marshall (January 27, 1993)
• Warren E. Burger (June 28, 1995)
• William J. Brennan, Jr. (July 28, 1997)
• Harry A. Blackmun (March 8, 1999)
• William H. Rehnquist (September 6–7, 2005)
• Antonin Scalia (February 19, 2016)