| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Oakes | city | Parish of Clarendon | Jamaica | 18.0833333 | -77.2333333 | 705 | 27998 |
| Oakes Pen | city | Parish of Clarendon | Jamaica | 17.95 | -77.1666667 | 275 | 29080 |
| Oaks | city | Parish of Clarendon | Jamaica | 18.0833333 | -77.2333333 | 705 | 27998 |
| Oberlin | city | Parish of Saint Andrew | Jamaica | 18.1333333 | -76.85 | 918 | 118115 |
| Occasion Town | city | Parish of Saint Catherine | Jamaica | 17.9 | -77.1333333 | 3 | 24636 |
| Ocho Rios | city | Parish of Saint Ann | Jamaica | 18.4166667 | -77.1166667 | 0 | 5182 |
| Ocho Rios Bay | city | Parish of Saint Ann | Jamaica | 18.4166667 | -77.1166667 | 0 | 5182 |
| Old Barracks | city | Parish of Saint Ann | Jamaica | 18.2166667 | -77.4 | 2024 | 19165 |
| Old Barracks | city | Parish of Saint Mary | Jamaica | 18.3 | -76.9833333 | 941 | 24164 |
| Old England | city | Parish of Manchester | Jamaica | 17.9833333 | -77.4666667 | 1794 | 30373 |
| Old England Church | city | Parish of Manchester | Jamaica | 17.9833333 | -77.4666667 | 1794 | 30373 |
| Old Harbor | city | Parish of Saint Catherine | Jamaica | 17.9333333 | -77.1166667 | 59 | 38547 |
| Old Harbour | city | Parish of Saint Catherine | Jamaica | 17.9333333 | -77.1166667 | 59 | 38547 |
| Old Harbour Bay | city | Parish of Saint Catherine | Jamaica | 17.9 | -77.2666667 | 121 | 26271 |
| Old Harbour Bay | city | Parish of Saint Catherine | Jamaica | 17.9 | -77.0833333 | 0 | 28147 |
| Old Hope | city | Parish of Westmoreland | Jamaica | 18.2333333 | -78.2333333 | 45 | 19562 |
| Old House | city | Parish of Clarendon | Jamaica | 17.9 | -77.35 | 91 | 26223 |
| Old Lee Gate | city | Parish of Saint Thomas | Jamaica | 17.95 | -76.4666667 | 692 | 17280 |
| Old Pera | city | Parish of Saint Thomas | Jamaica | 17.8666667 | -76.3166667 | 0 | 5484 |
| Old Rotherwood | city | Parish of Westmoreland | Jamaica | 18.1833333 | -77.9833333 | 1886 | 26357 |
| Old Shafton | city | Parish of Westmoreland | Jamaica | 18.1333333 | -78.0166667 | 357 | 14047 |
| Old Yarmouth | city | Parish of Clarendon | Jamaica | 17.8833333 | -77.2833333 | 95 | 26271 |
| Oldbury | city | Parish of Manchester | Jamaica | 17.9666667 | -77.5333333 | 2522 | 30367 |
| Olympic Gardens | city | Parish of Saint Andrew | Jamaica | 18.0166667 | -76.8333333 | 118 | 147311 |
| Onslow | city | Parish of Saint Thomas | Jamaica | 17.9333333 | -76.45 | 505 | 17264 |
| Onslows | city | Parish of Saint Thomas | Jamaica | 17.9333333 | -76.45 | 505 | 17264 |
| Oracabessa | city | Parish of Saint Mary | Jamaica | 18.4 | -76.95 | 462 | 14185 |
| Orange | city | Parish of Saint James | Jamaica | 18.45 | -77.8666667 | 229 | 36454 |
| Orange Bay | city | Parish of Hanover | Jamaica | 18.3666667 | -78.3166667 | 72 | 10953 |
| Orange Bay | city | Parish of Portland | Jamaica | 18.2166667 | -76.6166667 | 193 | 5729 |
| Orange Cove | city | Parish of Hanover | Jamaica | 18.45 | -78.2 | 91 | 12129 |
| Orange Hall | city | Parish of Saint Ann | Jamaica | 18.35 | -77.05 | 1181 | 19745 |
| Orange Hill | city | Parish of Westmoreland | Jamaica | 18.2333333 | -78.3166667 | 52 | 13107 |
| Orange Hill | city | Parish of Saint Ann | Jamaica | 18.35 | -77.05 | 1181 | 19745 |
| Orange Hill | city | Parish of Saint Mary | Jamaica | 18.2666667 | -76.8 | 55 | 20500 |
| Orange Park | city | Parish of Saint Ann | Jamaica | 18.3333333 | -77.1333333 | 1220 | 17347 |
| Orange River Pen | city | Parish of Clarendon | Jamaica | 17.9666667 | -77.1833333 | 387 | 31067 |
| Orange Valley | city | Parish of Trelawny | Jamaica | 18.4666667 | -77.7166667 | 396 | 15509 |
| Orange Valley | city | Parish of Saint Ann | Jamaica | 18.4333333 | -77.3666667 | 905 | 13114 |
| Orange Valley | city | Parish of Saint Catherine | Jamaica | 18.1333333 | -77.1833333 | 1574 | 34885 |
| Orangefield | city | Parish of Saint Catherine | Jamaica | 18.15 | -77.0666667 | 557 | 46121 |
| Orchard | city | Parish of Hanover | Jamaica | 18.45 | -78.05 | 308 | 12909 |
| Ormiston | city | Parish of Westmoreland | Jamaica | 18.1833333 | -77.95 | 1286 | 25815 |
| Osborne Store | city | Parish of Clarendon | Jamaica | 17.95 | -77.3333333 | 134 | 26344 |
| Osbornes | city | Parish of Saint Mary | Jamaica | 18.2333333 | -76.7666667 | 515 | 21436 |
| Osborns | city | Parish of Saint Mary | Jamaica | 18.2333333 | -76.7666667 | 515 | 21436 |
| Outon | city | Parish of Saint Ann | Jamaica | 18.3666667 | -77.3166667 | 2175 | 17343 |
| Owens | city | Parish of Saint Ann | Jamaica | 18.2666667 | -77.3833333 | 2234 | 17353 |
| Oxford | city | Parish of Manchester | Jamaica | 18.2 | -77.6333333 | 961 | 21605 |
| Oxford | city | Parish of Trelawny | Jamaica | 18.45 | -77.5833333 | 770 | 10208 |
| Oxford | city | Parish of Saint Catherine | Jamaica | 18.1 | -77.1166667 | 1994 | 46953 |
| Oxford | city | Parish of Saint Thomas | Jamaica | 17.8666667 | -76.35 | 0 | 5831 |
| Oyster Bay | city | Parish of Trelawny | Jamaica | 18.4833333 | -77.6333333 | 52 | 6973 |