The busts are all located on the First Floor.
Two in the parlor (Alexander I and Napoleon)
Six in the Entrance Hall (Voltaire, Jefferson, Turger, Hamilton, and 2 Native American heads)
Four in the Tea Room (Washington, Franklin, John Paul Jones, Lafayette)
Two in the Cabinet Room (John Adams and Jefferson)
Three in the Library (Madison, Roscoe, some unknown dude)
Two in the South Square Room (Jefferson’s granddaughters, Cornelia and Ann)
The answer is 19.