If you display the American flag next to other flags or pennants, place it on the right side of a single flag or at the center of a group and slightly higher than the other flags
Do not allow the flag to touch the ground, floor, water, or anything else beneath it.
Whether the flag hangs from an angled or horizontal staff, be sure the union or canton (the rectangle with the stars) is at the peak. (Hanging the flag with the union down signals extreme distress.) When our President declares the flag to be flown at half-staff, it is acceptable to hang the flag from a horizontal staff with the union down, though your neighbors may not understand why you're doing this.
When the flag is displayed either horizontally or vertically against a wall, the union should be at the top and to your left. When displayed in a window, the flag should be hung so that the union is on the left when you see it from the street.
Though it is customary to fly the flag from sunrise to sunset, the U.S. Code says that "when a patriotic effect is desired," you can display it around the clock. If you do, you should illuminate it with a light.
If you wear a lapel flag, pin it on the left side, near your heart.
When flags of two or more nations are displayed, they are to be flown from separate staffs of the same height. The flags should be of approximately equal size. International usage forbids the display of the flag of one nation above that of another nation in time of peace.
The flag, when flown at half-staff, should be first hoisted to the peak for an instant and then lowered to the half-staff position. The flag should be again raised to the peak before it is lowered for the day. By "half-staff" is meant lowering the flag to one-half the distance between the top and bottom of the staff. Crepe streamers may be affixed to spear heads or flagstaffs in a parade only by order of the President of the United States.
By Executive Order, the flag flies 24 hours a day at the following locations:
• The Betsy Ross House, Philadelphia, Pennsylvania
• The White House, Washington, D.C.
• U.S. Capitol, Washington, D.C.
• Washington Monument, Washington, D.C.
• Iwo Jima Memorial to U.S. Marines, Arlington, Virginia
• Battleground in Lexington, MA (site of first shots in the Revolutionary War)
• Winter encampment cabins, Valley Forge, Pennsylvania
• Fort McHenry, Baltimore, Maryland (a flag flying over Fort McHenry after a battle during the War of 1812 provided the inspiration for The Star-Spangled Banner
• The Star-Spangled Banner Flag House, Baltimore, Maryland (site where the famed flag over Fort McHenry was sewn)
• Jenny Wade House in Gettysburg, Pennsylvania (Jenny Wade was the only civilian killed at the battle of Gettysburg)
• U.S.S. Arizona Memorial, Pearl Harbor, Hawaii
• All custom points and points of entry into the United States
a. The flag should be displayed on all days, especially on
o New Year's Day, January 1
o Inauguration Day, January 20
o Martin Luther King Jr.'s birthday, third Monday in January
o Lincoln's Birthday, February 12
o Washington's Birthday, third Monday in February
o Easter Sunday (variable)
o Mother's Day, second Sunday in May
o Armed Forces Day, third Saturday in May
o Memorial Day (half-staff until noon), the last Monday in May
o Flag Day, June 14
o Independence Day, July 4
o Labor Day, first Monday in September
o Constitution Day, September 17
o Columbus Day, second Monday in October
o Navy Day, October 27
o Veterans Day, November 11
o Thanksgiving Day, fourth Thursday in November
o Christmas Day, December 25
o and such other days as may be proclaimed by the President of the United States
o the birthdays of States (date of admission)
o and on State holidays.