Flag poles for residential use generally fall between 15 feet and 25 feet in height. This applies to flag poles mounted in-ground as opposed to those attached to buildings.
The length of the flag itself depends on the length of the flag pole. The correct ratio is at least 1:4 or one quarter. This means the length of the flag should be at least one quarter the height of the pole. For example, a 20-foot pole would carry at least a 5-foot flag.Learn more about Statistics