Ontario Basketball comprises approximately 175 clubs and associations.  Any not-for-profit organization that is involved in the development and growth of amateur basketball can apply to become an affiliate member of Ontario Basketball.

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A competitive club is one that develops athletes with the intention of having them compete at the regional and/or provincial level against other Ontario Basketball clubs.  Club, also referred to as Rep, teams participating in league games, exhibition games and sanctioned tournaments are considered competitive member clubs.

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A house league development club is a club that develops athletes with the intention of having them compete within their own club structure i.e. House League.  Participants do not play any games again outside Ontario Basketball clubs.

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Many clubs have both a competitive and a house league division.