| Illinois Academy of Physician Assistants | Academic & Science |
| Indiana Academy of Physician Assistants | Academic & Science |
| Idaho Academy Of Physician Assistants | Academic & Science |
| International Association of Practising Accountants | Accounts and Finance |
| Institute of Analytics Professionals of Australia | Business |
| Idaho Association of Public Accountants | Business |
| Indian Association of Paediatric Anaesthesiologists | Community |
| Indian Association of Physician Assistants | Community |
| Inter American Press Association | Community |
| International Au Pair Association | Community |
| Iranian American Parents Association | Community |
| International Association of Physicians in Audiology | Community |
| Illinois Activity Professionals Association | Community |
| International Association of Professional Advisers | Community |
| Illinois Asphalt Pavement Association | Community |
| International Adventure Park Association International | Community |
| Independent Automotive Professionals Association | Community |
| International Adventure Park Association | Community |
| Industrial Accident Prevention Association | Community |
| Independent Airport Parking Association | General |
| International Awards for Powered Access | General |
| Impact Assessment and Project Appraisal | General |
| International Award for Public Art | General |
| Independent Automotive | General |
| Iowa Administrative Procedures Act | Governmental |
| Instrument Approach Procedures Automation | Governmental |
| International Airline Passengers Association | Governmental |
| International Alliance for the Prevention of AIDS | Governmental |
| International Affairs Policy and Analysis | International |
| International Alliance of Protected Areas | International |
| Italian American Police Association | International |
| International Association of Physiologic Aesthetics | International |
| International Airline Passenger Association | International |
| International Au Pair Agencies | International |
| Indo American Psychiatric Association | Medical |
