| Community Psychiatric Nurses Association | Academic & Science |
| Chiral Peptide Nucleic Acid | Academic & Science |
| Coated Products of North America | Business |
| Canadian Practical Nurses Association | Business |
| Chicago Professional Networking Association | Business |
| City Point Neighborhood Association | Community |
| Clokey Park Neighborhood Association | Community |
| Chowen Park Neighborhood Association | Community |
| Club Penguin National Army | Community |
| Concord Park Neighborhood Association | Community |
| Cherokee Park Neighborhood Association | Community |
| Cuesta Park Neighborhood Association | Community |
| College Park Neighborhood Association | Community |
| Charlton Pollard Neighborhood Association | Community |
| Columbia Park Neighborhood Association | Community |
| Colony Park Neighborhood Association | Community |
| Capitol Park Neighborhood Association | Community |
| Cleveland Park Neighborhood Association | Community |
| Conference on Peace and Nonviolent Action | Community |
| Computer Programming and Network Administration | Computing |
| Classified-Processing-Nodes Allocation | Computing |
| Citrix Program Neighborhood Agent | Computing |
| Clickable peptide nucleic acids | General |
| Contract Partners of North America | General |
| Costs Per Net Acquisition | General |
| Cheer Pack North America | General |
| Car to Pedestrian Nearside Adult | General |
| Centro de Planejamento de Natalidade Animal | Governmental |
| Carrizo Plain Natural Area | Governmental |
| Chesney Prairie Natural Area | Governmental |
| Community Psychiatric Nurses Association–now the MHNA–Mental Health Nursing Association | Medical |