- O'Briens Aveda InstituteCity: WillistonState: Vermont
- Oak Hills Christian CollegeCity: BemidjiState: Minnesota
- Oak Valley CollegeCity: RialtoState: California
- Oakland City UniversityCity: Oakland CityState: Indiana
- Oakland Community CollegeCity: Auburn HillsState: Michigan
- Oakland UniversityCity: Rochester HillsState: Michigan
- Oakton CollegeCity: Des PlainesState: Illinois
- Oakwood UniversityCity: HuntsvilleState: Alabama
- Oberlin CollegeCity: OberlinState: Ohio
- Oblate School of TheologyCity: San AntonioState: Texas
- Occidental CollegeCity: Los AngelesState: California
- Ocean CorporationCity: HoustonState: Texas
- Ocean County CollegeCity: Toms RiverState: New Jersey
- Ocean County Vocational-Technical SchoolCity: Toms RiverState: New Jersey
- Oconee Fall Line Technical CollegeCity: SandersvilleState: Georgia
- Odessa CollegeCity: OdessaState: Texas
- Oehrlein School of CosmetologyCity: East PeoriaState: Illinois
- Ogden-Weber Technical CollegeCity: OgdenState: Utah
- Ogeechee Technical CollegeCity: StatesboroState: Georgia
- Oglala Lakota CollegeCity: KyleState: South Dakota
- Ogle School Hair Skin Nails-ArlingtonCity: ArlingtonState: Texas
- Ogle School Hair Skin Nails-DallasCity: DallasState: Texas
- Ogle School Hair Skin Nails-DentonCity: DentonState: Texas
- Ogle School Hair Skin Nails-Ft WorthCity: Fort WorthState: Texas
- Ogle School Hair Skin Nails-HurstCity: HurstState: Texas
- Ogle School Hair Skin Nails-North DallasCity: DallasState: Texas
- Ogle School Hair Skin Nails-San AntonioCity: San AntonioState: Texas
- Ogle School Hair Skin Nails-StaffordCity: StaffordState: Texas
- Ogle School Hair Skin Nails-WillowbrookCity: HoustonState: Texas
- Oglethorpe UniversityCity: AtlantaState: Georgia
- Ohel Margulia SeminaryCity: MonseyState: New York
- Ohio Business College-Dayton-Driving AcademyCity: TrotwoodState: Ohio
- Ohio Business College-SanduskyCity: SanduskyState: Ohio
- Ohio Business College-SheffieldCity: Sheffield VillageState: Ohio
- Ohio Christian UniversityCity: CirclevilleState: Ohio
- Ohio Dominican UniversityCity: ColumbusState: Ohio
- Ohio Institute of Allied HealthCity: Huber HeightsState: Ohio
- Ohio Media School-CincinnatiCity: NorwoodState: Ohio
- Ohio Media School-ColumbusCity: ColumbusState: Ohio
- Ohio Media School-Valley ViewCity: Valley ViewState: Ohio
- Ohio Medical Career CollegeCity: DaytonState: Ohio
- Ohio Northern UniversityCity: AdaState: Ohio
- Ohio State Beauty AcademyCity: LimaState: Ohio
- Ohio State College of Barber StylingCity: ColumbusState: Ohio
- Ohio State School of Cosmetology-Canal WinchesterCity: CANAL WINCHESTERState: Ohio
- Ohio State School of Cosmetology-HeathCity: HeathState: Ohio
- Ohio State University Agricultural Technical InstituteCity: WoosterState: Ohio
- Ohio State University-Lima CampusCity: LimaState: Ohio
- Ohio State University-Main CampusCity: ColumbusState: Ohio
- Ohio State University-Mansfield CampusCity: MansfieldState: Ohio
- Ohio State University-Marion CampusCity: MarionState: Ohio
- Ohio State University-Newark CampusCity: NewarkState: Ohio
- Ohio Technical CollegeCity: ClevelandState: Ohio
- Ohio University-Chillicothe CampusCity: ChillicotheState: Ohio
- Ohio University-Eastern CampusCity: Saint ClairsvilleState: Ohio
- Ohio University-Lancaster CampusCity: LancasterState: Ohio
- Ohio University-Main CampusCity: AthensState: Ohio
- Ohio University-Southern CampusCity: IrontonState: Ohio
- Ohio University-Zanesville CampusCity: ZanesvilleState: Ohio
- Ohio Wesleyan UniversityCity: DelawareState: Ohio
- Ohlone CollegeCity: FremontState: California
- Ohr Hameir Theological SeminaryCity: PeekskillState: New York
- Okaloosa Technical CollegeCity: Fort Walton BeachState: Florida
- Oklahoma Baptist UniversityCity: ShawneeState: Oklahoma
- Oklahoma Christian UniversityCity: EdmondState: Oklahoma
- Oklahoma City Community CollegeCity: Oklahoma CityState: Oklahoma
- Oklahoma City UniversityCity: Oklahoma CityState: Oklahoma
- Oklahoma Panhandle State UniversityCity: GoodwellState: Oklahoma
- Oklahoma State University Center for Health SciencesCity: TulsaState: Oklahoma
- Oklahoma State University Institute of TechnologyCity: OkmulgeeState: Oklahoma
- Oklahoma State University-Main CampusCity: StillwaterState: Oklahoma
- Oklahoma State University-Oklahoma CityCity: Oklahoma CityState: Oklahoma
- Oklahoma Technical CollegeCity: TulsaState: Oklahoma
- Oklahoma Wesleyan UniversityCity: BartlesvilleState: Oklahoma
- Old Dominion UniversityCity: NorfolkState: Virginia
- Old Town Barber College - KCCity: Kansas CityState: Missouri
- Old Town Barber College-WichitaCity: WichitaState: Kansas
- Oliver Finley Academy of CosmetologyCity: BoiseState: Idaho
- Olivet Nazarene UniversityCity: BourbonnaisState: Illinois
- Olney Central CollegeCity: OlneyState: Illinois
- Olympian Academy of CosmetologyCity: LAS CRUCESState: New Mexico
- Olympic CollegeCity: BremertonState: Washington
- Omega Graduate SchoolCity: DaytonState: Tennessee
- Omega Institute of CosmetologyCity: HoumaState: Louisiana
- Omega Studios' School of Applied Recording Arts & SciencesCity: RockvilleState: Maryland
- One Stop AcademyCity: FayettevilleState: North Carolina
- Onondaga Community CollegeCity: SyracuseState: New York
- Onondaga Cortland Madison BOCESCity: LiverpoolState: New York
- Opelousas School of CosmetologyCity: OpelousasState: Louisiana
- Oral Roberts UniversityCity: TulsaState: Oklahoma
- Orange Coast CollegeCity: Costa MesaState: California
- Orange County Community CollegeCity: MiddletownState: New York
- Orange Technical CollegeCity: OrlandoState: Florida
- Orange Technical College-East CampusCity: Winter ParkState: Florida
- Orange Technical College-South CampusCity: OrlandoState: Florida
- Orange Technical College-West CampusCity: Winter GardenState: Florida
- Orange Ulster BOCES-Practical Nursing ProgramCity: NewburghState: New York
- Orangeburg Calhoun Technical CollegeCity: OrangeburgState: South Carolina
- Oregon Coast Community CollegeCity: NewportState: Oregon
- Oregon College of Oriental MedicineCity: PortlandState: Oregon
- Oregon Health & Science UniversityCity: PortlandState: Oregon
- Oregon Institute of TechnologyCity: Klamath FallsState: Oregon
- Oregon State UniversityCity: CorvallisState: Oregon
- Oregon State University-Cascades CampusCity: BendState: Oregon
- Orion InstituteCity: PerrysburgState: Ohio
- Orion Technical CollegeCity: DavenportState: Iowa
- Orleans Niagara BOCES-Practical Nursing ProgramCity: LockportState: New York
- Orleans Technical CollegeCity: PhiladelphiaState: Pennsylvania
- Orlo School of Hair Design and CosmetologyCity: AlbanyState: New York
- Osceola Technical CollegeCity: KissimmeeState: Florida
- Osceola Technical College - Poinciana CampusCity: KissimmeeState: Florida
- Osceola Technical College - St. Cloud CampusCity: St. CloudState: Florida
- Otero CollegeCity: La JuntaState: Colorado
- Otero College - La Junta High SchoolCity: La JuntaState: Colorado
- Otis College of Art and DesignCity: Los AngelesState: California
- Otsego Area BOCES-Practical Nursing ProgramCity: OneontaState: New York
- Ottawa University-Kansas CityCity: Overland ParkState: Kansas
- Ottawa University-MilwaukeeCity: BrookfieldState: Wisconsin
- Ottawa University-OnlineCity: Overland ParkState: Kansas
- Ottawa University-OttawaCity: OttawaState: Kansas
- Ottawa University-SurpriseCity: SurpriseState: Arizona
- Otterbein UniversityCity: WestervilleState: Ohio
- Ouachita Baptist UniversityCity: ArkadelphiaState: Arkansas
- Our Lady of the Lake UniversityCity: San AntonioState: Texas
- Owens Community CollegeCity: PerrysburgState: Ohio
- Owensboro Community and Technical CollegeCity: OwensboroState: Kentucky
- Oxford Academy of Hair Design IncCity: SeymourState: Connecticut
- Oxnard CollegeCity: OxnardState: California
- Ozark Christian CollegeCity: JoplinState: Missouri
- Ozarka CollegeCity: MelbourneState: Arkansas
- Ozarks Technical Community CollegeCity: SpringfieldState: Missouri