| Abbreviation | Definition |
|---|---|
| ISMEA | Israel Small and Medium Enterprises Authority |
| ISWA | Interlocal Solid Waste Authority |
| ITA | Industry Training Authority |
| ITA | Integrated Transport Authority |
| ITDA | Innovation and Technical Design Authority |
| ITDA | Integrated Tribal Development Authority |
| ITDA | Internal Trade Development Authority |
| ITE | Industry Test Environment |
| IWA | Indio Water Authority |
| JAA | Job Approval Authority |
| JAA | Joint Aviation Authority |
| JBRA | Jackson Brownfield Redevelopment Authority |
| JCAA | Jamaica Civil Aviation Authority |
| JCHA | Jefferson County Housing Authority |
| JCIA | Johnston County Industrial Authority |
| JCPA | Jersey City Parking Authority |
| JCSA | James City Service Authority |
| JDA | Jovian Detention Authority |
| JTA | Jackson Transit Authority |
| JTDA | Jacksonville Tourism Development Authority |