| Place name | Origin & meaning | Source |
| Jacaranda Avenue (R.Terrace) | Later name for Stockton Street. | Hunter,C: History and Heritage. |
| Jackson Street (Hamilton North) | Earlier name for Bates Street. | Gov Gaz No 168 19.12.1975. |
| James Street (Merewether) | After James Walton Mitchell Merewether. | C.E.Smith Dec 1966. |
| James Street (Toronto) | Named after an early resident. | Clack,E: Early History of Toronto, |
| James Street (Wallsend) | After William James, Manager Purified Coal and Coke Co. | Wallsend Public School Centenary 1862 - 1962. |
| Jane Street (Mayfield) | Early name for Villiers Street. | NCC Planning Department. |
| Janet Street( Merewether) | After Janet McCabe Merewether, a member of the Merewether family. | C.E.Smith Dec 1966. |
| Jarrah Place (Muswellbrook) | Native flora. | Muswellbrook Chronicle 28.01.1983. |
| Jarrett Street (Toronto) | William Jarrett, manager Exclesior Land Co. | Clack,E: Early History of Toronto. |
| Jefferson Park (Merewether) | Named after Ald. Wm. Jefferson | Dixon,J:History of Merewether |
| Jefferson Street (Merewether) | Alderman William H. Jefferson, a former mayor of Merewether. | Dixon,J: History of Merewether. |
| Jenner Street (Merewether) | After George Jenner , former mayor of the Hamilton Munipal Council. | Hamilton Municipal Jubilee Souvenir |
| Jerrys Plains | Said to have been named after an Irish Convict and appeared in usage as early as 1827. | RAHS Journal vol 39 pt 3, 1953. |
| Jerrys Plains 2 | Named after an assigned servant, Jerry Butler, who lit a fire with gunpowder and blew off part of his hand | NS 22. 07. 1953 |
| Jersey Place (Muswellbrook) | Dairy cattle breed. | Muswellbrook Chronicle 28.01.1983. |
| Jesmond | After the Tynside town in the North of England. | Social Sciences Teacher Vol13.no5.30.11.1983 |
| Jesmond Park (Jesmond) | Originated when the Scottish Australian Mining Company's manager R.G.Robinson gave the land to Lambton Council when developing streets along the company's frontage on the land. | Docherty,J: Newcastle, Making of an Industrial City. |
| Jewells (nr, Belmont) | Named after Jules [note spelling] Windeyer, old Newcastle resident who used to go shooting there | Lake Macquarie Past & Present. |
| Jigadee Creek | Early name for Sandy Creek, branch of Dora Creek. | NMH 15.01.1976. |
| Joan Street (Adamstown) | Fletcher Street west of Date Street. | Gov Gaz No 32 Folio 981 24.02.1939. |
| Joe Richley Reserve (New Lambton) | To honour Mr Joe Richley, who played a major role in the establishment of Blackbutt Reserve. | NMH 20.07.1983. |
| Joe's hill | Named after "Joe the marine" Thomas Hunt the husband of Molly Morgan. Located outside Greta | NMH Saturday magazine 18.03.00 p 8 |
| John and Joseph Creek(Qurindi) | Named by Andrew Loder after the two little hills near the 1836 Gaspard School calling one Jacob the other Joseph after the Scripture. | Telfer,W: Wallabadah Manuscript p118 |
| John Parade (Merewether) | After Edward John Merewether. | C.E.Smith Dec 1966. |
| John Street (Cooks Hill) | Former name for Charles Street. | NCC Planning Department. |
| John Street (Mayfield) | Crebert Street from Woodstock to Crebert Street. | NCC Planning Department. |
| John Street (Wallsend) | Formerly Tyrell Street between Bunn and Robert Streets. | NCC Planning Department. |
| John Street (Warners Bay) | Bonarius family names and named after the Auctioneer who subdividied portions of the land. | Vertical file LHD919.442/WAR |
| John's River (Coppernook) | After a sawyer of that name, who was the first to cut red cedar there. | NMH 24.12.1953 |
| Johnson Park ( Lambton) | Named after a former mayor of Lambton and previously called Griffith's Flat. | Hoy,E: History of Lambton/New Lambton |
| Johnston Town | Area around the large orchard and vineyard near William Johnston's land at Barnsley.It contained 13 houses at one time. | Back to Westy booklet. |
| Jonestown | Portion of Cardiff South bounded by Elizabeth and Fifth and Sixth Streets. Part of John Jones original grant. | Lake Macquarie Past & Present. |
| Jordan Street (Muswellbrook) | Formerly Mitchell Lane, named after Alderman D.Jordan, mayor 1942 -44. | Muswellbrook Chronicle 28.01.1983. |
| Joseph Street (Rankin Park) | After one of the original land grantees in the area. | Lake Macquarie & District Historical Society feb 1970. |
| Jubilee Park (Carrington) | Named to commemorate the Golden Jubilee of the Carrington Municipalities Incorporation in 1937 by Mr E.S.Spooner. | NMH 12.11.1937 |
| Jubilee Road (Wallsend) | After Jubilee Mine. | Wallsend Public School Centenary 1862 - 1962. |
| Junction Street (Merewether) | The southern side of the railway line from Alice to Morgan Streets. | Dixon,J: History of Merewether. |
| June Street (Merewether) | After member sof the Merewether family. | Dixon,J: History of Merewether. |