| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| O'Brien | city | Florida | United States | 30.03806 | -82.94028 | 59 | 1610 |
| O'Neil | city | Florida | United States | 30.61722 | -81.51444 | 13 | 6057 |
| Oak | city | Florida | United States | 29.25194 | -82.11583 | 65 | 20057 |
| Oak Grove | city | Florida | United States | 30.90861 | -87.4275 | 265 | 1415 |
| Oak Grove | city | Florida | United States | 30.92472 | -86.5675 | 141 | 1172 |
| Oak Grove | city | Florida | United States | 29.79028 | -85.29694 | 6 | 510 |
| Oak Grove | city | Florida | United States | 30.69167 | -84.73333 | 272 | 3312 |
| Oak Grove | city | Florida | United States | 28.59972 | -82.04361 | 104 | 1615 |
| Oak Grove | city | Florida | United States | 27.48194 | -81.87167 | 65 | 1696 |
| Oak Harbor | city | Florida | United States | 30.36 | -81.425 | 9 | 54819 |
| Oak Hill | city | Florida | United States | 30.24611 | -81.75139 | 19 | 88291 |
| Oak Hill | city | Florida | United States | 28.86417 | -80.85472 | 13 | 5427 |
| Oak Hill Park | city | Florida | United States | 30.24472 | -81.77806 | 72 | 88291 |
| Oak Knoll | city | Florida | United States | 27.51139 | -82.27778 | 65 | 923 |
| Oak Knoll Estates | city | Florida | United States | 30.52361 | -84.26639 | 134 | 43775 |
| Oak Landing | city | Florida | United States | 30.25333 | -81.43444 | 3 | 45880 |
| Oak Park | city | Florida | United States | 30.10222 | -84.49583 | 36 | 826 |
| Oak Ridge | city | Florida | United States | 28.47083 | -81.42472 | 95 | 114943 |
| Oak Ridge Park | city | Florida | United States | 29.63556 | -81.95361 | 124 | 3309 |
| Oak Terrace | city | Florida | United States | 27.83889 | -81.9775 | 134 | 4848 |
| Oakdale | city | Florida | United States | 30.71028 | -85.18528 | 78 | 4196 |
| Oakhurst | city | Florida | United States | 30.3875 | -81.67361 | 6 | 115984 |
| Oakhurst Acres | city | Florida | United States | 27.86389 | -82.8375 | 49 | 65876 |
| Oakhurst Shores | city | Florida | United States | 27.825 | -82.8 | 6 | 75843 |
| Oakhurst Terrace | city | Florida | United States | 27.85278 | -82.825 | 45 | 127209 |
| Oakhurst historical | city | Florida | United States | 27.83889 | -82.80194 | 39 | 127209 |
| Oakland | city | Florida | United States | 28.55472 | -81.63333 | 121 | 16399 |
| Oakland Park | city | Florida | United States | 28.80361 | -81.6775 | 62 | 34999 |
| Oakland Park | city | Florida | United States | 26.17194 | -80.13222 | 9 | 248038 |
| Oakwood Villa | city | Florida | United States | 30.31778 | -81.57917 | 22 | 108036 |
| Ocala | city | Florida | United States | 29.18694 | -82.14028 | 98 | 53483 |
| Ocala Estates | city | Florida | United States | 29.20194 | -82.30972 | 55 | 5319 |
| Ocala Highlands Estates | city | Florida | United States | 29.25528 | -82.14444 | 85 | 19606 |
| Ocala Park Ranch | city | Florida | United States | 29.25278 | -82.22167 | 88 | 8219 |
| Ocala Ridge | city | Florida | United States | 29.19306 | -82.21389 | 72 | 14245 |
| Ocala Thoroughbred Acres | city | Florida | United States | 29.17222 | -82.24361 | 78 | 14245 |
| Ocala Waterway | city | Florida | United States | 29.06889 | -82.19306 | 78 | 7835 |
| Ocean Breeze Park | city | Florida | United States | 27.23556 | -80.22083 | 3 | 42331 |
| Ocean City | city | Florida | United States | 30.44083 | -86.61361 | 36 | 67224 |
| Ocean Ridge | city | Florida | United States | 26.52667 | -80.04861 | 3 | 101994 |
| Ocean View Heights | city | Florida | United States | 25.73639 | -80.23806 | 3 | 241157 |
| Ocean Vue | city | Florida | United States | 26.31778 | -80.07722 | 0 | 87304 |
| Oceanway | city | Florida | United States | 30.46667 | -81.6325 | 19 | 17151 |
| Ocheesee | city | Florida | United States | 30.57556 | -85.01694 | 104 | 1484 |
| Ocheesee Gardens | city | Florida | United States | 30.65722 | -84.97 | 101 | 2837 |
| Ocheesee Landing | city | Florida | United States | 30.58194 | -84.96611 | 45 | 1370 |
| Ocheeseulga historical | city | Florida | United States | 30.4 | -85.06667 | 52 | 2115 |
| Ochisi historical | city | Florida | United States | 30.48333 | -84.95 | 147 | 714 |
| Ochlockonee | city | Florida | United States | 30.47222 | -84.40694 | 88 | 20465 |
| Ochopee | city | Florida | United States | 25.90111 | -81.30361 | 3 | 167 |
| Ocklawaha | city | Florida | United States | 29.0425 | -81.92944 | 68 | 10714 |
| Ocklockonee historical | city | Florida | United States | 30.66667 | -84.3 | 108 | 2703 |
| Ocoee | city | Florida | United States | 28.56889 | -81.54417 | 147 | 37073 |
| Octahatchee | city | Florida | United States | 30.57917 | -83.19056 | 167 | 1048 |
| Odena | city | Florida | United States | 29.74 | -85.18639 | 6 | 1398 |
| Odessa | city | Florida | United States | 28.19361 | -82.59194 | 52 | 14279 |
| Ohathlockhouchy historical | city | Florida | United States | 30.53333 | -84.48333 | 187 | 2410 |
| Ojus | city | Florida | United States | 25.94806 | -80.15083 | 3 | 214083 |
| Okahumpka | city | Florida | United States | 28.7475 | -81.89611 | 111 | 6802 |
| Okahumpka historical | city | Florida | United States | 28.76667 | -81.9 | 68 | 17107 |
| Okaloo | city | Florida | United States | 30.91556 | -86.48611 | 295 | 1741 |
| Okawahathako historical | city | Florida | United States | 29.56667 | -81.71667 | 19 | 3460 |
| Okeafenoke Swamp historical | city | Florida | United States | 30.16667 | -82.41667 | 157 | 1976 |
| Okeechobee | city | Florida | United States | 27.24361 | -80.83 | 22 | 7328 |
| Okeelanta | city | Florida | United States | 26.60944 | -80.71167 | 13 | 1536 |
| Oktahatko historical | city | Florida | United States | 30.93333 | -85.26667 | 88 | 1403 |
| Old Bay View | city | Florida | United States | 30.43694 | -86.11 | 45 | 1334 |
| Old Callaway | city | Florida | United States | 30.14333 | -85.57167 | 9 | 30877 |
| Old Duette | city | Florida | United States | 27.53667 | -82.09944 | 111 | 1071 |
| Old Fernandina | city | Florida | United States | 30.68944 | -81.4525 | 9 | 11487 |
| Old Grove | city | Florida | United States | 25.95861 | -81.60889 | 3 | 2471 |
| Old Henley Place | city | Florida | United States | 28.39778 | -82.14222 | 68 | 8614 |
| Old Marco Junction | city | Florida | United States | 26.0225 | -81.70083 | 3 | 8913 |
| Old Myakka | city | Florida | United States | 27.31278 | -82.26694 | 32 | 1029 |
| Old Town | city | Florida | United States | 29.60111 | -82.98194 | 19 | 1251 |
| Oldsmar | city | Florida | United States | 28.03389 | -82.66528 | 6 | 46352 |
| Olga | city | Florida | United States | 26.71861 | -81.7125 | 9 | 10126 |
| Olive | city | Florida | United States | 30.50861 | -87.25528 | 124 | 58350 |
| Olustee | city | Florida | United States | 30.20389 | -82.42889 | 144 | 1976 |
| Olympia Heights | city | Florida | United States | 25.72639 | -80.35556 | 6 | 283811 |
| Ona | city | Florida | United States | 27.48167 | -81.91917 | 82 | 2186 |
| Oneco | city | Florida | United States | 27.44722 | -82.54639 | 22 | 113395 |
| Opa-locka | city | Florida | United States | 25.90194 | -80.25056 | 6 | 325784 |
| Open Sands | city | Florida | United States | 30.205 | -85.85778 | 0 | 3692 |
| Oponys Town historical | city | Florida | United States | 27.78333 | -81.8 | 111 | 2458 |
| Orange | city | Florida | United States | 30.2275 | -85.025 | 45 | 757 |
| Orange Bend | city | Florida | United States | 28.86083 | -81.79889 | 72 | 17389 |
| Orange Blossom | city | Florida | United States | 28.68778 | -81.78667 | 98 | 4490 |
| Orange Blossom Gardens Mobile Home Park historical | city | Florida | United States | 28.94667 | -81.94778 | 68 | 13171 |
| Orange Blossom Hills | city | Florida | United States | 28.995 | -82.00083 | 91 | 11059 |
| Orange Blossom Hills South | city | Florida | United States | 28.92806 | -81.94833 | 72 | 13171 |
| Orange City | city | Florida | United States | 28.94861 | -81.29889 | 49 | 28786 |
| Orange City Hills | city | Florida | United States | 28.92861 | -81.29639 | 72 | 28786 |
| Orange Grove Villas | city | Florida | United States | 28.28639 | -82.18861 | 124 | 27860 |
| Orange Heights | city | Florida | United States | 29.71944 | -82.13944 | 131 | 2062 |
| Orange Home | city | Florida | United States | 28.82917 | -81.99583 | 62 | 12585 |
| Orange Lake | city | Florida | United States | 29.42333 | -82.21694 | 98 | 4107 |
| Orange Mills | city | Florida | United States | 29.68472 | -81.57333 | 9 | 5267 |
| Orange Mountain | city | Florida | United States | 28.50278 | -81.72 | 124 | 8525 |
| Orange Park | city | Florida | United States | 30.16583 | -81.70667 | 6 | 42710 |
| Orange Springs | city | Florida | United States | 29.50583 | -81.94556 | 59 | 2002 |
| Orange Terrace | city | Florida | United States | 27.85278 | -82.83333 | 22 | 127209 |
| Orangedale | city | Florida | United States | 28.15722 | -81.90528 | 121 | 12759 |
| Orangedale | city | Florida | United States | 30.00833 | -81.61333 | 3 | 4511 |
| Orangetree | city | Florida | United States | 26.2925 | -81.58861 | 16 | 619 |
| Orchid | city | Florida | United States | 27.7725 | -80.41722 | 9 | 13205 |
| Orient Park | city | Florida | United States | 27.97222 | -82.37306 | 9 | 78767 |
| Orienta Gardens | city | Florida | United States | 28.65722 | -81.38222 | 72 | 152755 |
| Oriole Beach | city | Florida | United States | 30.37361 | -87.09139 | 0 | 7689 |
| Orlando | city | Florida | United States | 28.53806 | -81.37944 | 111 | 178127 |
| Orlovista | city | Florida | United States | 28.53806 | -81.46056 | 108 | 112357 |
| Ormond Beach | city | Florida | United States | 29.28556 | -81.05611 | 3 | 79372 |
| Ormond-by-the-Sea | city | Florida | United States | 29.34889 | -81.06667 | 3 | 20986 |
| Orsino | city | Florida | United States | 28.5275 | -80.66556 | 6 | 259 |
| Ortega | city | Florida | United States | 30.27028 | -81.70833 | 13 | 98007 |
| Ortega Farms | city | Florida | United States | 30.25194 | -81.72222 | 9 | 111422 |
| Ortega Forest | city | Florida | United States | 30.26139 | -81.71083 | 13 | 111422 |
| Ortega Terrace | city | Florida | United States | 30.26389 | -81.70083 | 3 | 98007 |
| Ortona | city | Florida | United States | 26.81278 | -81.31583 | 22 | 440 |
| Ortona | city | Florida | United States | 29.25222 | -81.02583 | 13 | 63204 |
| Osceola | city | Florida | United States | 28.79278 | -81.05944 | 3 | 2101 |
| Oslo | city | Florida | United States | 27.58639 | -80.38056 | 22 | 51191 |
| Osochi historical | city | Florida | United States | 30.63333 | -84.95 | 98 | 3250 |
| Osowaw Junction | city | Florida | United States | 27.57917 | -80.835 | 72 | 383 |
| Osprey | city | Florida | United States | 27.19583 | -82.49056 | 3 | 23692 |
| Osteen | city | Florida | United States | 28.84583 | -81.16278 | 72 | 12418 |
| Otis | city | Florida | United States | 30.30917 | -81.89528 | 85 | 8303 |
| Otter Creek | city | Florida | United States | 29.32472 | -82.77194 | 19 | 651 |
| Overstreet | city | Florida | United States | 29.99806 | -85.36889 | 9 | 1984 |
| Oviedo | city | Florida | United States | 28.66972 | -81.20833 | 91 | 21540 |
| Owl Landing | city | Florida | United States | 30.01806 | -85.01611 | 6 | 599 |
| Oxford | city | Florida | United States | 28.92722 | -82.0375 | 95 | 5750 |
| Oyster Lodge | city | Florida | United States | 30.96778 | -87.23417 | 52 | 2973 |
| Ozello | city | Florida | United States | 28.82556 | -82.65722 | 6 | 3584 |
| Ozona | city | Florida | United States | 28.06917 | -82.77583 | 16 | 102195 |
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