| Iron Mountain (mi) | Airport Code |
| Internet Montana | Business |
| Imperial Tobacco Group, PLC. | Business |
| Invesco Insured Municipal trust | Business |
| Industrial Microbial Testing | Business |
| Interactive Multimedia Technologies PVT., LTD. | Business |
| Innovative Micro Technology | Business |
| Information and Media Technology | Community |
| Institute of Musical Traditions | Community |
| Institute for Market Transformation | Community |
| In Melbourne Tonight | Community |
| Independent Music Teacher | Community |
| Integrated Media Technologies | Community |
| Independent Music Teachers | Community |
| International Mobile Telecommunications (IMT-2000) | Computer and Networking |
| Intelligent Mask Technology | Computing |
| Iconic Modeling Tool | Computing |
| Input Mapping Table | Computing |
| International Mobile Telephone | Computing |
| Information Multimedia Technology | Computing |
| Integrated Microwave Technologies | Computing |
| Imsmart | Cryptocurrency |
| Information Management Tool | Database Management |
| Inspiratory Muscle Training | General |
| Idaho Mountain Touring | General |
| Intensive Mobility Training | General |
| Intelligent Manual Transmission | General |
| Instant Money Transfer | General |
| Industrial Manufacturing Technician | General |
| Idiopathic Macular Telangiectasia | General |
| Intake Manifold Timing | General |
| Intake Manifold Temperature | General |
| Intake Manifold Tuning | General |
| Immersed Tube Tunnel | General |
| Iowa Mold Tooling | General |
| Industry Market Trends | General |
| Innovative Manufacturing Technology | General |
| Institutions Markets Technologies | Governmental |
| International Medical Terminology | Governmental |
| Inmate Monitoring and Transfer | Governmental |
| International Marxist Tendency | International |
| International Money Transfer | International |
| International Medicine Transformation | International |
| Institute of Management Technology | Management College in India |
| Integrated Medical Technologies | Medical |
| Implantable Miniature Telescope | Medical |
| immunomodulatory therapy | Medical |
| immunotherapy | Medical |
| Inflammatory Myofibroblastic Tumour | Medical |
| Integrated Multidisciplinary Teams | Medical |
| Intima Media Thickness | Medical |
| Integrative Manual Therapy | Medical |
| Intimal-Medial Thickness | Medical |
| International Military Tribunal | Military and Defence |
| Initial Military Training | Military and Defence |
| Inter Machine Trunk | Networking |
| Moneytoken | Regional |
| Ford Airport, Iron Mountain, Michigan USA | Regional |
| Individual Movement Technique | Sports |
| International Mobile Telecommunications | Telecommunication |