A USGA GHIN number is a number that is issued to members of various golf associations in the United States when said member enters their club's handicap roster. Each individual is assigned a unique number that can be used to share their scores through various channels, including at other courses, their home club or online. Golfers holding memberships at more than one golf club that uses the service are generally required to have the same GHIN number at all locations.
Golfers possessing a GHIN number can also monitor their official USGA Handicap Index by using a GHIN Handicap Lookup tool provided on GHIN.com. Data provided in this tool is current according to the latest handicap revision period as set by the USGA. Alternatively, members can also view their personal scores that are used to calculate the handicap index. This calculation is typically done by using the last 20 scores recorded by the member.
The GHIN was established in 1981 to provide computation service for golf handicaps after a regional golf association approached the USGA for help. As of 2015, the GHIN is provided to over 12,000 clubs across the United States and computes handicap index data for approximately 2.3 million golfers.