In 2011, the Greater Toronto Hockey League and its affiliates consisted of 2,800 teams and around 40,000 players. It is currently the largest youth ice hockey organization in the world in terms of members. The league has expanded its area of operation over the years from primarily the city of Toronto to many of its surrounding municipalities. Currently, there are 51 separate associations that operate under the GTHL. These associations provide teams for the various age groups and divisions that make up the league. Around 275 GTHL alumni have gone on to play in North American professional ice hockey leagues, such as the National Hockey League and the defunct World Hockey Association.