| Abbreviation | Definition |
|---|---|
| ICFL | Inter County Football League |
| ICHD | Ingham County Health Department |
| ICHD | Ionia County Health Department |
| ICHD | Iredell County Health Department |
| ICHS | Iowa County Humane Society |
| ICLB | Ingham County Land Bank |
| ICMC | Islamic Center of McHenry County |
| ICMC | Islamic Center of Morris County |
| ICMC | Islamic Circle of Mercer County |
| ICOE | Imperial County Office of Education |
| ICORE | Iron County Outdoor Recreation Enthusiasts |
| ICPA | Itasca County Pickelball Association |
| ICRH | Isabella County Restoration House |
| ICTC | Immunization Collaboration of Tarrant County |
| ICTC | Inter County Training Consortium |
| ICTC | Isabella County Transportation Commission |
| ICWC | Iron County Watershed Coalition |
| ICWC | Islamic Center of Williamson County |
| IEOC | Inland Empire Orange County |
| IIOC | Islamic Institute of Orange County |