Holden's Triennial Directory Cork 1809
| Jackson | Elizabeth | Perfumer | George's St |
| Jackson | Mrs. | Cook St | |
| Jackson | Mrs. | Terrace | |
| Jacotin | Domonick | Teacher of French and Italian, and bookseller | Patrick St |
| Jaffeitts | Rich. | Grocery, tea and dye stuff warehouse | Shandon St |
| Jeffords | Miss E | Half Moon St | |
| Jefferson | Wm. | Merchant | Lapp's Quay |
| Jefferson | Mr. Wm. | Sand Quay | |
| Jamieson | H. | Muslin and calico warehouse | Marlborough St |
| Jenkins | Mrs. | Peter St | |
| Jennings | Montgomery and Son | Brokers | Coal Quay |
| Jennings | Tho. | Bleaching manufacturer | Brown St |
| Johnson | F.B. | Wine stores | Morgan St |
| Johnson | Andrew | Boot and shoemaker | Batchelor's Quay |
| Johnson | James | Cabinet maker | Hanover St |
| Johnson | Dr. | Grand Parade | |
| Johnson | Wm. | Attorney | George's St |
| Johnson | Mrs. N. | Coal Quay | |
| Johnston | Robt. Jun. | Wholesale clothier | Britain St |
| Johnston | Benj. | Woolcomber | Britain St |
| Johnston | J. | Livery stables | Bandon Rd |
| Johnston | Frank | Esq. | Britain St |
| Johnston | Mr. Robt. | Terrace | |
| Jones | Tho. | Carpet and blanket warehouse | North Main St |
| Jones | Abraham | Tallow chandler | North Main St |
| Jones | Isaac | White St | |
| Jones | J.T | Attorney | Marlborough St |
| Jones | Attorney | Princess St | |
| Jordan | J | Sail maker | Brown St |
| Jordan | Mrs. S | Coal Quay | |
| Joyce | Tho. | Patten maker | Broad La |
| Judge | Capt. Wm. | Bishop St |