| North Carolina Cyber Academy | Academic & Science |
| Natl Comm For Certifying Agencies | Business |
| National Commission for Certifying Agencies | Business |
| Newton College and Career Academy | Business |
| Newport Coast Community Assocition | Community |
| Newport Coast Community Association | Community |
| National Council for Curriculum and Assessment (Ireland) | Community |
| National Commission for the Certification of Acupuncturists | Community |
| National Collegiate Conference Association | Community |
| Northern California Concierge Association | Community |
| National Commission for Culture and the Arts | Community |
| National Coil Coating Association | Community |
| National Chemical Credit Association | Community |
| North Carolina Chiropractic Association | Community |
| National Christian Counselors Association | Community |
| Northeast Cutlery Collectors Association | Community |
| North Carolina Coaches Association | Community |
| National Child Care Association | Community |
| National Community Capital Association | Community |
| National Centre For Contemporary Arts | Community |
| New Covenant Christian Academy | Community |
| North Carolina Counseling Association | Community |
| National Catholic Church of America | Community |
| National Carpet Cleaners Association | Community |
| National Committee for Culture And | Community |
| New Creation Christian Academy | Community |
| National Coil Coatings Association | Community |
| North Carolina Correctional Associations | Community |
| National Centre for Computer Animation | Computing |
| National Certification Career Association | Educational Degree |
| National Coastal Condition Assessment | General |
| National Center for Creative Aging | General |
| Non Cash Current Assets | General |
| Non Conformance Corrective Action | General |
| Northern California Corvette Association | General |
| Nash Car Club of America | General |
| Nissan Car Club Australia | General |
| National Car Club Awards | General |
| National Custom Car Association | General |
| Northern Colorado Coaches Alliance | Governmental |
| National Council for Curriculum and Assessment | Governmental |
| National Council of Churches in Australia | Governmental |
| Naval Center for Cost Analysis | Governmental |
| National Community Care Alliance | Medical |
| National Cancer Care Alliance | Medical |
| National Centre For Clinical Audit (absorbed by National Institute for Health and Clinical Excellence–NIC) | Medical |
| National Commission for Certification of Acupuncturists (USA) | Medical |
| Neuroblastoma Children's Cancer Alliance | Medical |
| National Collegiate Cycling Association | Sports |
| Northern California Cricket Association | Sports |
