- Islandtarsney
- Illaunamadan
- Illaundrane
- Illaunimmil
- Illaunleagh
- Illaunnabarnagh
- Illaunnacogha
- Illaunnacusha
- Illaunnaweelaun
- Illaunsillagh
- Illaunslea
- Illaunstookagh
- Illauntannig
- Inch
- Inch Bridge
- Inch-Moor
- Inch-West
- Inchec Bridge
- Inchee
- Inchiclogh
- Inchicorrigane
- Inchinapoagh
- Inchinglanna
- Inishfoyle
- Inishikeelaghmore
- Inishkeragh
- Inishnabro
- Inishtooskert
- Inishtooskert
- Inishvickillane