The United States Flag Code outlines certain guidelines for the use, display, and disposal of the flag. For example, the flag should never be dipped to any person or thing, unless it is the ensign responding to a salute from a ship of a foreign nation. The flag should never be allowed to touch the ground and, if flown at night, must be illuminated. If the edges become tattered through wear, the flag should be repaired or replaced.

It is a common myth that if a flag touches the ground or a flag that is soiled must be burned as well. While a flag that is currently touching the ground and a soiled flag are unfit for display, neither situation is permanent and thus the flag does not need to be burned if the unfit situation is remedied.

When a flag is so tattered that can no longer serve as a symbol of the United States, it should be destroyed in a dignified manner, preferably by burning. The American Legion and other organizations regularly conduct dignified flag-burning ceremonies, often on Flag Day, June 14.

Although US Flag Code states that "The flag should not be used as part of a costume or athletic uniform, except that a flag patch may be used on the uniform of military personnel, firefighters, police officers, and members of patriotic organizations", many athletic teams have worn the flag as a part of their uniform. Notably, Major League Baseball placed the flag on the back of all uniforms following the 9/11 attacks, and the US team in the 2006 World Baseball Classic wore a flag patch on their left sleeve. For Independence Day and 9/11 2008, with the exception of the Toronto Blue Jays, All MLB teams will wear navy-blue versions of their hats, with an American flag imposed inside their own logo.