Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Orlando Public Library | Building | 29 | Orange | 28 32 36 N | 081 22 34 W |
| Orlando Public Library - Eastland | Building | 31 | Orange | 28 33 16 N | 081 21 14 W |
| Orlando Public Library - Fort Gatlin | Building | 26 | Orange | 28 29 56 N | 081 22 29 W |
| Orlando Public Library - Kissimmee Branch | Building | 17 | Orange | 28 17 41 N | 081 23 54 W |
| Orlando Public Library - Northgate | Building | 20 | Seminole | 28 35 21 N | 081 14 14 W |
| Orlando Ranch | Locale | 6 | Osceola | 28 11 11 N | 080 52 36 W |
| Orlando Regional Medical Center | Hospital | 30 | Orange | 28 31 33 N | 081 22 37 W |
| Orlando Regional Medical Center Heliport | Airport | 30 | Orange | 28 31 32 N | 081 22 36 W |
| Orlando Vocational/Technical Center | School | 30 | Orange | 28 32 50 N | 081 22 34 W |
| Orlando Worship Center | Church | 37 | Orange | 28 33 41 N | 081 33 09 W |
| Orlovista | Populated Place | 34 | Orange | 28 32 18 N | 081 27 37 W |
| Orlovista Elementary School | School | 33 | Orange | 28 32 31 N | 081 27 31 W |
| Ormond Beach | Populated Place | 2 | Volusia | 29 17 09 N | 081 03 21 W |
| Ormond Beach Elementary School | School | 5 | Volusia | 29 17 01 N | 081 03 28 W |
| Ormond Beach First Christian Church | Church | 5 | Volusia | 29 16 31 N | 081 03 14 W |
| Ormond Beach Junior High School | School | 3 | Volusia | 29 18 27 N | 081 04 12 W |
| Ormond Beach Mall | Locale | 2 | Volusia | 29 15 46 N | 081 02 04 W |
| Ormond Beach Memorial Hospital | Hospital | 4 | Volusia | 29 17 33 N | 081 02 40 W |
| Ormond Beach Municipal Airport | Airport | 8 | Volusia | 29 18 05 N | 081 06 48 W |
| Ormond Beach Post Office (historical) | Post Office | 2 | Volusia | 29 17 09 N | 081 03 21 W |
| Ormond Beach Public Library | Building | 3 | Volusia | 29 17 01 N | 081 02 59 W |
| Ormond Beach Union Church | Church | 3 | Volusia | 29 16 56 N | 081 03 44 W |
| Ormond Plaza | Locale | 2 | Volusia | 29 17 40 N | 081 03 00 W |
| Ormond Tomb State Park | Park | 8 | Volusia | 29 23 05 N | 081 07 56 W |
| Ormond-by-the-Sea | Populated Place | 4 | Volusia | 29 20 57 N | 081 03 59 W |
| Orsino | Populated Place | 1 | Brevard | 28 31 40 N | 080 39 55 W |
| Ortega | Populated Place | 7 | Duval | 30 16 14 N | 081 42 29 W |
| Ortega Bridge | Bridge | -2 | Duval | 30 16 50 N | 081 42 19 W |
| Ortega Elementary School | School | 6 | Duval | 30 16 34 N | 081 42 12 W |
| Ortega Farms | Populated Place | 5 | Duval | 30 15 08 N | 081 43 19 W |
| Ortega Forest | Populated Place | 5 | Duval | 30 15 42 N | 081 42 38 W |
| Ortega Hills | Summit | 6 | Duval | 30 12 55 N | 081 42 35 W |
| Ortega Kindergarten | School | 4 | Duval | 30 16 25 N | 081 42 18 W |
| Ortega River | Stream | | Duval | 30 17 09 N | 081 42 10 W |
| Ortega Terrace | Populated Place | 3 | Duval | 30 15 51 N | 081 42 02 W |
| Ortega Village Square | Locale | -4 | Duval | 30 15 06 N | 081 39 39 W |
| Orthodox Church of Saint Stephen | Church | 29 | Orange | 28 39 16 N | 081 21 04 W |
| Ortona | Populated Place | 7 | Glades | 26 48 47 N | 081 18 56 W |
| Ortona | Populated Place | 4 | Volusia | 29 15 09 N | 081 01 32 W |
| Ortona Cemetery | Cemetery | 7 | Glades | 26 49 01 N | 081 18 07 W |
| Ortona Church | Church | 5 | Glades | 26 47 54 N | 081 18 47 W |
| Ortona Elementary School | School | 4 | Volusia | 29 14 51 N | 081 01 24 W |
| Ortona Lock | Dam | 4 | Glades | 26 47 21 N | 081 18 17 W |
| Osage Lake | Lake | 33 | Orange | 28 21 04 N | 081 38 08 W |
| Osborn Branch | Stream | | Hardee | 27 23 15 N | 081 58 48 W |
| Osborne Bay | Swamp | 42 | Holmes | 30 57 45 N | 085 42 57 W |
| Osborne Park | Park | 2 | Palm Beach | 26 49 07 N | 080 04 29 W |
| Oscar Scherer State Park | Park | 3 | Sarasota | 27 10 30 N | 082 27 58 W |
| Osceola | Populated Place | 3 | Seminole | 28 47 35 N | 081 03 33 W |
| Osceola Baptist Church | Church | 21 | Osceola | 28 17 31 N | 081 24 34 W |
| Osceola Cemetery | Cemetery | 24 | Gilchrist | 29 44 25 N | 082 39 53 W |
| Osceola Church of the Nazarene | Church | 20 | Osceola | 28 17 26 N | 081 25 04 W |
| Osceola County | Civil | 25 | Osceola | 28 02 31 N | 081 07 27 W |
| Osceola Creek | Stream | | Broward | 26 05 41 N | 080 10 13 W |
| Osceola Elementary School | School | 1 | Indian River | 27 38 13 N | 080 23 09 W |
| Osceola Elementary School | School | 4 | Volusia | 29 17 13 N | 081 02 24 W |
| Osceola High School | School | 20 | Osceola | 28 17 44 N | 081 24 37 W |
| Osceola High School | School | 21 | Osceola | 28 17 01 N | 081 25 31 W |
| Osceola Hospital | Hospital | 21 | Osceola | 28 17 35 N | 081 24 33 W |
| Osceola Independent Private School | School | 21 | Osceola | 28 15 03 N | 081 16 19 W |
| Osceola Lake | Lake | 13 | Hillsborough | 28 10 18 N | 082 35 11 W |
| Osceola Landing | Locale | 10 | Marion | 29 15 56 N | 081 56 33 W |
| Osceola Memory Gardens | Cemetery | 16 | Osceola | 28 18 01 N | 081 23 44 W |
| Osceola Middle School | School | 38 | Marion | 29 10 55 N | 082 07 58 W |
| Osceola Middle School | School | 3 | Pinellas | 27 51 23 N | 082 46 25 W |
| Osceola Municipal Golf Course | Locale | | Escambia | 30 26 27 N | 087 17 24 W |
| Osceola National Forest | Forest | 40 | Baker | 30 18 46 N | 082 26 14 W |
| Osceola Natural Area | Park | 39 | Baker | 30 22 46 N | 082 23 43 W |
| Osceola Ranger Office | Locale | 49 | Baker | 30 12 12 N | 082 25 45 W |
| Osceola Ranger Station | Locale | 62 | Columbia | 30 11 19 N | 082 34 26 W |
| Osceola Regional Hospital Heliport | Airport | 20 | Osceola | 28 17 56 N | 081 24 38 W |
| Osceola Trail | Trail | 45 | Baker | 30 16 46 N | 082 30 07 W |
| Osceola Wildlife Management Area | Park | 40 | Baker | 30 18 46 N | 082 26 14 W |
| Osceola Work Center | Locale | 56 | Columbia | 30 12 58 N | 082 36 07 W |
| Osceolas Camp | Locale | 4 | Collier | 26 06 32 N | 081 05 44 W |
| Oslo | Populated Place | 4 | Indian River | 27 35 12 N | 080 22 49 W |
| Oslo Square | Locale | 3 | Indian River | 27 35 15 N | 080 22 39 W |
| Osochi (historical) | Populated Place | 30 | Jackson | 30 38 01 N | 084 57 00 W |
| Osowaw Junction | Populated Place | 19 | Okeechobee | 27 34 46 N | 080 50 05 W |
| Osprey | Populated Place | 3 | Sarasota | 27 11 46 N | 082 29 25 W |
| Osswald Park | Park | 1 | Broward | 26 09 26 N | 080 09 39 W |
| Osteen | Populated Place | 15 | Volusia | 28 50 46 N | 081 09 45 W |
| Osteen Bridge | Bridge | 0 | Volusia | 28 48 10 N | 081 12 37 W |
| Osteen Cemetery | Cemetery | 12 | Volusia | 28 53 32 N | 081 09 20 W |
| Osteen Elementary School | School | 13 | Volusia | 28 50 34 N | 081 09 32 W |
| Ostego Bay | Bay | -3 | Lee | 26 25 07 N | 081 53 14 W |
| Otis | Populated Place | 26 | Duval | 30 18 34 N | 081 53 42 W |
| Otis German Shopping Center | Locale | 2 | Broward | 26 01 08 N | 080 10 06 W |
| Ott Point | Cape | 0 | Miami-Dade | 25 26 36 N | 080 12 04 W |
| Otter Bay | Swamp | 43 | Columbia | 30 15 34 N | 082 32 49 W |
| Otter Branch | Stream | | Walton | 30 38 51 N | 086 01 07 W |
| Otter Camp | Locale | 32 | Leon | 30 18 29 N | 084 37 01 W |
| Otter Creek | Gut | 3 | Wakulla | 30 03 09 N | 084 25 38 W |
| Otter Creek | Populated Place | 8 | Levy | 29 19 30 N | 082 46 18 W |
| Otter Creek | Stream | | Bay | 30 22 27 N | 085 55 24 W |
| Otter Creek | Stream | | Bay | 30 23 31 N | 085 58 53 W |
| Otter Creek | Stream | | Calhoun | 30 26 43 N | 085 11 04 W |
| Otter Creek | Stream | | Citrus | 28 46 55 N | 082 37 17 W |
| Otter Creek | Stream | | Holmes | 30 48 02 N | 085 57 28 W |
| Otter Creek | Stream | | Lee | 26 43 29 N | 081 43 04 W |
| Otter Creek | Stream | | Levy | 29 11 56 N | 082 46 21 W |
| Otter Creek | Stream | | Monroe | 25 26 05 N | 080 57 33 W |
| Otter Creek | Stream | | Taylor | 29 56 15 N | 083 42 56 W |
| Otter Creek Church | Church | 25 | Holmes | 30 46 43 N | 085 57 12 W |
| Otter Creek Church | Church | 6 | Wakulla | 30 04 31 N | 084 24 53 W |
| Otter Creek Swamp | Swamp | 3 | Franklin | 29 47 51 N | 084 47 11 W |
| Otter Drain | Stream | | Baker | 30 28 02 N | 082 18 49 W |
| Otter Key | Island | 0 | Monroe | 25 08 33 N | 080 47 12 W |
| Otter Key | Island | 1 | Sarasota | 27 18 56 N | 082 34 12 W |
| Otter Lake | Lake | 1 | Wakulla | 30 01 26 N | 084 25 14 W |