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- One Hour Heating & Air Conditioning of Hickory (dba)Conover, NC
- One Hour Heating & Air of the Triad (dba)Asheboro, NC
- One Hour Heating and Air Conditioning of Charlotte(dba)Charlotte, NC
- One Hour Heating and Air Crystal Coast (dba)Morehead City, NC
- One Man Service Heating & Air Conditioning, LLCFuquay Varina, NC
- One Salem Gc Jv, LLCCornelius, NC
- One Source Contractors LLCWilmington, NC
- OneCall HVAC & Air Conditioning, LLCRaleigh, NC
- Onecall Plumbing and Septic, LLCStar, NC
- Onesimo Gutierrez CardosoGastonia, NC
- OneSource Construction Solutions LLCCharlotte, NC
- Onley Anderson WilliamsRobbinsville, NC
- Online Tec SystemsSanford, NC
- Onnit Construction, LLCCharlotte, NC
- Onshore Contracting LLCHampstead, NC
- Onshore Ventures LLCWrightsville Beach, NC
- Onsite Electrical ServicesRaleigh, NC
- Onslow County GovernmentJacksonville, NC
- Onslow County ofJacksonville, NC
- Onslow County OF (dba Onslow County Emergency Services)Jacksonville, NC
- Onslow Heating & Air Conditioning LLCJacksonville, NC
- Ontech Electric LLCMount Olive, NC
- Onward Electrical LLCCharlotte, NC
- Onward Pro Services LLCHigh Point, NC
- Onyx Development, LLCLincolnton, NC
- OP Electric CorpSaint Pauls, NC
- Open Hearts PlaceMorganton, NC
- Operation Improvement IncHendersonville, NC
- OPI Builders LLCGastonia, NC
- Opia Homes LLCMatthews, NC
- Optimal Effect, LLCApex, NC
- Optimal Electric Inc.Boone, NC
- Optimal Home, LLCGibsonville, NC
- Optimal Plumbing Solutions, Inc.Clayton, NC
- Optimal Tek LLCFletcher, NC
- Optimum Fire & Security (dba)Wilmington, NC
- Optimum Low Voltage LLCWilmington, NC
- Option One ElectricClayton, NC
- Oral's Construction Company Inc.Red Springs, NC
- Orange County ElectricHillsborough, NC
- Orange Kudzu Construction LLCCharlotte, NC
- ORCA (Orellana Real Estate, Construction, and Abatement) LLCMorganton, NC
- Orca Blue, LLCWake Forest, NC
- Orchards Properties Construction, LLCHendersonville, NC
- Orcutt Construction, LLCClayton, NC
- Orion NC LLCRaleigh, NC
- Orlando and Son's Construction LLCRobbins, NC
- Orlando Jesus OlivaMatthews, NC
- Ormond Energy (dba)Princeton, NC
- Orozco's Designs & Building LLCPrinceton, NC
- ORR Custom Construction LLCSouthport, NC
- Orville R. WoodardStoneville, NC
- OS Electric LLCWilmington, NC
- Osborne Family Homes LLCLittleton, NC
- Osborne Plumbing and DrainCharlotte, NC
- Osborne's Plumbing, LLCFleetwood, NC
- Oscar M. HenriquezHillsborough, NC
- Oschmann's Electrical SolutionsFranklin, NC
- Osgood Whipple Building Company LLCOcean Isle Beach, NC
- Osiel Gerardo Flores NavaForest City, NC
- Osprey Plumbing LLCHampstead, NC
- Osprey Roofing, Inc.Wilmington, NC
- Osteen & Lemmons Electrical & Mechanical Services IncHendersonville, NC
- Osteen & Lemmons Electrical & Mechanical Services, Inc.Hendersonville, NC
- Osteen Plumbing LLCHendersonville, NC
- Otali LLCDenver, NC
- OTBX Custom Builders, LLCSneads Ferry, NC
- Otey Electric L.L.C.Lexington, NC
- Otis Elevator CompanyRaleigh, NC
- Otis Thomas Smith Jr.Graham, NC
- Otis Wilkins PlumbingLumberton, NC
- Otter Creek Builders LLCTopton, NC
- Otter Creek Woodworking IncThomasville, NC
- Otto REIG, LLC | AKA: Renewable Energy Integration GroupCharlotte, NC
- Otto's Total Landscaping, LLCRaleigh, NC
- Ottone Homes, LLCStatesville, NC
- Otwell Electric, LLCHigh Point, NC
- Our Home Electric LLCWilmington, NC
- Our House Enterprises L.L.C.Statesville, NC
- Ousmane S BangouraCharlotte, NC
- Out Front Construction, LLCSiler City, NC
- Out the Door Plumbing (dba)Pittsboro, NC
- Outdoor Contracting, Inc.Indian Trail, NC
- Outdoor Influence Landscaping Inc.Waxhaw, NC
- Outdoor Innovations, LLCOcean Isle Beach, NC
- Outdoor Lighting, Inc.Durham, NC
- Outdoor Type Lifestyle, LLCTrinity, NC
- Outer Banks Excavating Inc.Kitty Hawk, NC
- Outer Banks Home Design, Inc.Grandy, NC
- Outer Banks LP Gas & Appliance Services (dba)Kill Devil Hills, NC
- Outer Banks Plumbing LLCKitty Hawk, NC
- Outreach Electrical ServiceHolly Ridge, NC
- Outrider Electric LLCWilmington, NC
- OV Electrical Contractor, LLCSanford, NC
- OV SEPTIC AND DEMOLITION LLCWalstonburg, NC
- Ovanova Construction Services LLCCedar Grove, NC
- Ovanova Construction Services LLCCedar Grove, NC
- Ovenell Homes IncMills River, NC
- Over & Under Electric, LLCStatesville, NC
- Overby Electrical Services LLCFranklinton, NC