| Commonwealth Honors Academy | Academic & Science |
| Christian Heritage Academy | Academic & Science |
| Société Historique du Canada | Academic & Science |
| Canadian Historical Association | Academic & Science |
| Central Hinds Academy | Academic & Science |
| Chattanooga (tn) | Airport Code |
| Customs House Agent | Business |
| Champion International Corporation | Business |
| Cheerful Help Available | Business |
| Commonwealth Healthcare Alliance | Business |
| California Hospital Association | Business |
| Connecticut Hospital Association | Business |
| Customs House Agents | Business |
| Chemical Hamiltonian Approach | Chemistry |
| Charlotte Housing Authority | Community |
| Community Health Advocates | Community |
| Culture, Health, and Amenities | Community |
| ChildHelp USA, Inc. | Community |
| Cultural Heritage Alliance | Community |
| Chicago Heart Association | Community |
| Committee on House Administration | Community |
| Crafting and Hobby Association | Community |
| Craft Hobby Association | Community |
| Crafts and Hobby Association | Community |
| Chat File | Computing |
| Channel a | Computing |
| Channel Adapter | Computing |
| Cluster Health Advisor | Computing |
| Christian Hackers Association | Computing |
| Concentric Hemispherical Analyzer | Computing |
| Charlotte Hackers Anonymous | Computing |
| Certified Hotel Administrator | Educational Degree |
| Chat (irc Data) | File Type |
| Click Here A | General |
| Click Here A**hole | General |
| Chassis Only | General |
| Daihatsu Charade | General |
| Charger | General |
| Craft and Hobby Association | General |
| Capital Homestead Account | General |
| Centrally Heated Air | General |
| Cabarrus Health Alliance | Governmental |
| Chicago Housing Authority | Governmental |
| Catholic Health Association | Healthcare |
| CHAWAPALL | Indian Railway Station |
| Certified Haccp Auditor | Jobs |
| Community Health Assessment | Medical |
| Christ Hospital Association | Medical |
| Canine Hydrotherapy Association | Medical |
| Cambridge Health Alliance | Medical |
| Colorado Hospital Association | Medical |
| Concept Hazard Analysis | Military and Defence |
| Cliff Hanger Antenna | Radio Science |
| Canada Health Act | Regional |
| Chattanooga, Tennessee USA | Regional |
| Chamorro | Regional |
| Charlotte Hornets | Sports |
| Certified Horsemanship Association | Sports |
| College Hockey America | Sports |
