| Customer Oriented Architecture | Academic & Science |
| College Of Alameda | Academic & Science |
| Canadian Orthopaedic Association | Academic & Science |
| Crimean Olympic Academy | Academic & Science |
| Craft Of Architecture | Academic & Science |
| College Of Agriculture | Academic & Science |
| Corrections Officers Academy | Academic & Science |
| Cost Of Attendance | Academic & Science |
| Committee On Accreditation | Academic & Science |
| Chart of Accounts | Accounts and Finance |
| Columbia (ca) | Airport Code |
| Cable Operators Association | Associations & Organizations |
| Critical Observable Action | Business |
| Certificate of Authorization | Business |
| Commissioned Officers Association | Business |
| Certificate of Authority | Business |
| Certified OpenStack Administrator | Business |
| Certificate of Accuracy | Business |
| Certificate Of Appropriateness | Business |
| Certificate Of Altruism | Business |
| Coachmen Industries, Inc. | Business |
| Certificate Of Authentication | Business |
| Coastal Contacts Incorporated (de-listed) | Business |
| Collaboration Optimization and Analytics | Business Management |
| Certification of Authority | Certifications |
| Cultural Organization of the Arts | Community |
| Colorado Optometric Association | Community |
| Commissioned Officers Association (PHS) | Community |
| Connecticut Ornithological Association | Community |
| Container Owners Association | Community |
| Conservation Opportunity Areas | Community |
| Condominium Owners Association | Community |
| Council for Older Adults | Community |
| Council On Aging | Community |
| Chance Of Achievement | Community |
| Children Of Alcoholics | Community |
| Christians Of Age | Community |
| Certificate of Operating Authority | Community |
| Children Of Apocolypse | Community |
| Compliance Oriented Architecture | Computer Hardware |
| Country Of Assembly | Computing |
| Confirm On Arrival | Computing |
| Care Of Address | Computing |
| Certificate Of Analysis | Computing |
| College of The Albemarle | Educational Institute |
| College of The Atlantic | Educational Institute |
| College of Architecture | Educational Institute |
| Change of Amplification | Electronics |
| Content Object Array | General |
| Comprehensive Operational Analysis | General |
| Continuous Online Assessment | General |
| Conchologists of America | General |
| Coat of Arms | General |
| Cost Of Attendence | General |
| Circuit Of the Americas | General |
| Courses of Action | General |
| Communications Capsule for Open Air Motoring | General |
| Cadillac Owners Association | General |
| Centro Operativo Autostradale | General |
| Comite d'Organisation de l'Automobile | General |
| Corolla | General |
| Chart Of Account | General |
| Coming of Age | General |
| Comprehensive Operations Analysis | General |
| Charts Of Accounts | General |
| Call on Arrival | General |
| Change of Authorization | General |
| Commission on Opticianry Accreditation | General |
| Certificates of Analysis | General |
| Collaborators and Other Affiliations | General |
| Clash of Avatars | General |
| Contract of Afreightment | General |
| Coarctation of the Aorta | General |
| Contract Of Affreightment | General |
| Clean Oil and Adjust | General |
| Carrot-Onion Alliance | General |
| Cheer Officers of America | General |
| Commission On Accreditation | General |
| Cronym Or Abbreviation | General |
| Call Of Action | General |
| Cost Of Ageing | General |
| Cuteness Overload Airbag | General |
| Clean Ocean Action | General |
| Call Options American | General |
| Cream Of Apricot | General |
| Certificate Of Achievement | General |
| Change Of Address | General |
| Crown Of Ages | General |
| Condition of Assembly | General |
| Council of the Americas | Governmental |
| Court of Appeals | Governmental |
| Class Of Admission | Governmental |
| Commission On Audit | Governmental |
| Canadian Orientation Abroad | Governmental |
| City Of Austin | Governmental |
| Crackheads Of America | Governmental |
| City of Atlanta | Governmental |
| Council On Accreditation | Governmental |
| Council of Architecture | Indian Government Educational Organization |
| KAKINADA PORT | Indian Railway Station |
| Comité Obrero Antipolítico | International |
| Community Online Academy | Internet |
| Certified Ophthalmic Assistant | Jobs |
| Community Oncology Alliance | Medical |
| Certified Orthodontic Assistant | Medical |
| California Optometric Association | Medical |
| Clinical Outcome Assessment | Medical |
| Clinical Outcome Assessments | Medical |
| Condition On Admission | Medical |
| California Orthopaedic Association | Medical |
| Center of Attention | Messaging |
| Confirmation of Availability | Messaging |
| Card of Admission | Messaging |
| Course of Action | Military and Defence |
| Comptroller of The Army | Military and Defence |
| Certificate of Authenticity | Softwares |
| Center Operations Area | Space Science |
| Cheerleaders of America | Sports |
| Challenged Outdoorsmen of America | Sports |
| Columbia Airport | Transport & Travel |