- National Athletic Trainers Association Board of Certification Inc
- National Athletic Trainers' Association
- National Bar Association
- National Beauty Culturists League Inc.
- National Benefit Resources - UHG
- National Benevolent Association
- National Benevolent Association of the Christian Church
- National Black Caucus of State Legislators
- National Black Child Development Institute
- National Black Nurses Association
- National Black United Fund Inc.
- National Business Education Association
- National Business Travel Association
- National Catholic Educational Association NCEA)
- National Cattlemen's Beef Association
- National Center For Small Communities
- National Child Support Enforcement Association
- National City Bank
- National Civil Rights Museum
- National Committee to Preserve Social Security and Medicare
- National Confectioners Association
- National Conference Center
- National Conference of Community Justice
- National Conference on Public Employee Retirement Systems
- National Congress for Community Economic Development
- National Congress of American Indians
- National Cooperative Bank
- National Corn Growers Association
- National Council of Churches
- National Council of Gray Panthers Networks
- National Council of Higher Education Loan Programs, Inc.
- National Council of Teachers of Mathematics
- National Council on the Aging, Inc.
- National Court Reporters Association
- National Cremation Society
- National Crime Prevention Council
- National Datacare Corporation
- National Defense Industrial Association
- National Defense Transportation Association
- National Demolition Association
- National Dental Association
- National Dental EDI Council
- National Directory of Certified Public Accountants
- National Disease Research Interchange
- National Education Association
- National Electric Manufacturers Association
- National Electrical Contractors Association
- National Electrical Manufacturers Association
- National Exchange Bank and Trust
- National Federation of Asian American United Methodists