ClubLocationLeagueTierFounded
OKC Enegry U23——OKC EnergyOklahomaDissolved Inactive—2013OKC Energy U23——ONU TigersOlivet—OSASeattle, WANPSL - Northwest Conference42015Oakland BuccaneersOakland, CA—Oakland ClippersOakland, CADissolved 1969—1966Oakland Golden GrizzliesOakland, CANCAA Division ICL-1UNKOakland RootsOakland, CAUSL Championship22018Oakland StompersOakland, CADissolved 1978—1978Oakleigh Cannons——Ocala StampedeOcalaDissolved 2015—2011Ocean City Nor'eastersOcean City, NUSL League Two - Mid Atlantic Division41996Ogden Outlaws——Ohio State BuckeyesColumbus, OHNCAA Division ICL-11953Ohio Valley Fighting Scots——Oklahoma City SlickersOklahomaDissolved 1996—1982Old Dominion MonarchsNorfolk, VANCAA Division ICL-11989Omaha MavericksOmaha—2011One KnoxvilleKnoxville, TNUSL League One32021Oneonta Red Dragons——Orange County——Orange County Blue StarIrvine, CADissolved 2012—1997Orange County FCLake Forest, CAUPSL - SoCal Central - Premier DivisionRL-12009Orange County SCIrvine, CAUSL Championship22010Orange County SC U23Irvine, CADissolved 2019—2011Oregon State BeaversCorvallis, ORNCAA Division ICL-11988Orlando CityOrlando, FLMLS12013Orlando City BOrlando, FLMLS Next Pro32015Orlando City U23Lake MaryDissolved 2016—1998