Illalong / Illalung - Early name for Morpeth. Named by E.C. Close after the aboriginal name meaning swampy plains
Illalong Swamp - Co. Northumberland - a swamp lying to the E of Morpeth. 
Ingar - Street in Gwandalan, Lake Macquarie (Aboriginal meaning - Place of rest)
Ingar - Singleton district
Ingliston - Co. Northumberland - a township 120 N of Sydney. 
Invermein - Estate of Francis Little Situated Co. Brisbane on Dartbrook Invermere - Co. Roxburgh at Holdsworthy Downs -Dangar's Map 
Iona Estate - Paterson
Irish Town - Early name for the area around Mill Brook estate
Iron Bark Creek - (aboriginal name Toohrnbing) - near Newcastle on Dangar's 1828 map. Small southern tributary of the Hunter River falling into it below Hexham. 
Iron Bark Creek - Name given by Lieut. John Laurio Platt to his estate
Iron Bark Farm - near Newcastle
Ironbark Creek - Run belonging to Messrs Spencer at Liverpool Plains
Iron Stone Knob - Yarramalong. In 1913 Robert Woolley could point out a stringy bark tree on or near a hillock locally known as the Iron stone Knob, with Sir Thomas Livingstone Mitchells inscription still thereon.
Irrawang - Estate of James King. Aboriginal meaning where the water runs
Irrawang Cottage - Raymond Terrace. School in 1855
Isis River - Co. Brisbane - Stream rising in the Liverpool Range near Downey's Pass and flowing into the Page River near Gundy Gundy.