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- OceanHills Electrical ServicesClarkton, NC
- Oceanside Electrical LLCWilmington, NC
- Ochoa Construction Group, LLCWinston Salem, NC
- OConnell Plumbing LLCSwansboro, NC
- OConnor Electrical ServicesRaleigh, NC
- OCP Solutions, LLCSelma, NC
- Ocracoke Electrical ContractorsOcracoke, NC
- Ocracoke Heating, Air and Plumbing, Inc.Ocracoke, NC
- October Glory Farms, LLC.Vale, NC
- Odd Job Service Co. LLCTroutman, NC
- Odell Smith & Sons Plumbing Co., Inc.Spring Lake, NC
- Odom Air Heating & Cooling, LLCMoyock, NC
- Odus Hamilton Dulin JrCharlotte, NC
- ODW Construction and Development LLCSunset Beach, NC
- Odyssey Construction LLCPleasant Garden, NC
- Odyssey Electric LLCConcord, NC
- Odyssey Electrical Services LLCSmithfield, NC
- Odyssey Fire, LLCWilmington, NC
- Odyssey Fire, LLCWilmington, NC
- Off Road Iron Works LLCSeagrove, NC
- Offenberger PlumbingMount Ulla, NC
- Ogburn Electric Company Inc.Winston-Salem, NC
- OGF Custom Homes, LLCVale, NC
- OH Communities, LLCMint Hill, NC
- Ohio/oklahoma Hearst-argyle Tv, IncRaleigh, NC
- Ohms Electrical Solutions LLCWilkesboro, NC
- Ohmstead Plumbing Company, LLCForest City, NC
- Oil Heat Specialist, LLCRural Hall, NC
- OJ Heating & Cooling, LLCHenderson, NC
- Okeefe Innovations LLCWinston Salem, NC
- Okeefes Electrical, LLCJacksonville, NC
- Olayo Properties LLCWillow Spring, NC
- OLD CITY NEW BUILDERS LLCLeland, NC
- Old Dog Electrical Company LLCBurlington, NC
- Old Fort ElectricOld Fort, NC
- Old Fort Electric Heating and Air ConditioningOld Fort, NC
- Old Glory ElectricalWillow Spring, NC
- Old House Builders LLCConcord, NC
- Old Linemen Electric Co.Lincolnton, NC
- Old North Building Company, Inc, T/A | AKA: Absolute Roofing Systems and Construction | Old North Building Company, IncWilmington, NC
- Old North Hart Plumbing, LLCHolly Springs, NC
- OLD NORTH STATE BUILDERS LLCDunn, NC
- Old North State Refrigeration and Mechanical LLCCherryville, NC
- Old North State Unlimited, LLC DBA: DBA: Old North State ElectricNew Bern, NC
- Old River Electrical ContractorCanton, NC
- Old State ContractingSalisbury, NC
- Old West Energy Services, Inc.Raleigh, NC
- OLDE YORK POOLS LLCGastonia, NC
- Oleksandr Babych Sr.Asheville, NC
- Olena IvanovLowell, NC
- Olin Contracting, LLCCharlotte, NC
- Olin Viper SiteOlin, NC
- Olive Branch Plumbing LLCMooresville, NC
- Olive's Plumbing & Backflow Service, Inc.FOUR OAKS, NC
- Oliver Gene CampbellShelby, NC
- Oliver Timothy LedbetterHickory, NC
- Oliver Wayne RoachRobbinsville, NC
- Olivet Homes LLCNorth Wilkesboro, NC
- Olivia Anne Custom Home Builders, LLCOlin, NC
- Olivo Builders and Construction, INCAsheboro, NC
- Olympia & Wright Builders LLCCharlotte, NC
- Olympia & Wright LLCCharlotte, NC
- Olympus Construction Partners, LLCGreensboro, NC
- Omair HameedSiler City, NC
- Omar Nunez PlasensiaMonroe, NC
- Omega Air Conditioning, IncorporatedHigh Point, NC
- Omega Construction ElectricFuquay Varina, NC
- Omega Construction Inc.Winston Salem, NC
- Omega Development Company LLCAberdeen, NC
- Omega ElectricMint Hill, NC
- Omega Electrical LLCCharlotte, NC
- Omega Electrical SolutionsHendersonville, NC
- Omega Stone NC, L.L.C.Waxhaw, NC
- Omer OmerovicMint Hill, NC
- Omni Security Systems DBA: Security Group IncRaleigh, NC
- Omni Services of South Carolina IncWilmington, NC
- Omnitron Electric Company LLCMonroe, NC
- On 3 Build, LLCFayetteville, NC
- On Command LLCJacksonville, NC
- On Demand PlumbingFour Oaks, NC
- On Grade Construction, Inc.Jacksonville, NC
- On Our Way Services LLCZebulon, NC
- On par construction L.L.C.Waxhaw, NC
- On Point Heating & Cooling Inc.Wendell, NC
- On Point Heating and Cooling, LLCWendell, NC
- On Point Homes by Johnson LLCJackson Springs, NC
- On Point Plumbing and Filtration LLCPinehurst, NC
- On Point Plumbing, LLCFairview, NC
- On Site HVAC, LLCRichfield, NC
- On The Mark Builders LLCBurlington, NC
- On The Waters Construction LLCIron Station, NC
- On Time Electrical LLCCharlotte, NC
- On Time Plumbing & Air Corp. DBA: Mister Sparky ElectricHubert, NC
- On Time ServicesErwin, NC
- On Trax Enviromental IncOxford, NC
- One Block, LLCSalisbury, NC
- One Call Electric NC LLCCary, NC
- One Hour Heating & Air Conditioning (DBA)Kill Devil Hills, NC
- One Hour Heating & Air Conditioning (dba)Ocean Isle Beach, NC
- One Hour Heating & Air Conditioning Greenville, NC (dba)Greenville, NC