- Oquirrh Hills Subdivision 5, 6, 8 and 9
- Oquirrh (historical)
- Oquirrh Shadows
- Orchard Country Woods Condo
- Oxford Manor Condominium
- Old La Sal
- Oljato
- Oljato-Monument Valley
- Oak Creek
- Olmstead
- Orem Station
- Oak Creek Residential Area
- Oak City
- Ophir
- Oakley
- Orangeville
- Ogden Canyon Wildwood Estates
- Old Mill Subdivision Phase 1-3
- Oquirrh View
- Orchard Park Estates Subdivision Number One and Two
- Orchard Park Subdivision Number 3-7
- Ogden
- Oquirrh
- Orderville
- Orem
- Oasis
- Ouray