| Acronym | Definition |
|---|
| IRWA➣International Right of Way Association |
| IRWA➣Ipswich River Watershed Association (Ipswich, MA) |
| IRWA➣Iowa Rural Water Association |
| IRWA➣Illinois Rural Water Association |
| IRWA➣Idaho Rural Water Association |
| IRWA➣Indiana Romance Writers of America (Noblesville, IN) |