| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| OT Oberschwöditz | city | Sachsen-Anhalt | Germany | 51.09 | 12.04 | 830 | 7964 |
| OTBD (DOHA INTL) | airport | Qatar | 25.26 | 51.57 | 35 | 0 | |
| OTBH (AL UDEID AB) | airport | Qatar | 25.12 | 51.31 | 130 | 0 | |
| OTBK (AL KHOR) | airport | Qatar | 25.63 | 51.51 | 10 | 0 | |
| OTC (Bol Airport) | airport | 13.44 | 14.74 | 955 | 0 | ||
| OTD (Contadora Airport) | airport | 8.63 | -79.03 | 14 | 0 | ||
| OTERO MILL | airport | United States | 32.96 | -105.96 | 4603 | 0 | |
| OTH (SOUTHWEST OREGON RGNL) | airport | United States | 43.42 | -124.25 | 17 | 0 | |
| OTHELLO COMMUNITY HOSPITAL | airport | United States | 46.83 | -119.17 | 1038 | 0 | |
| OTHELLO MUNI | airport | United States | 46.79 | -119.08 | 1139 | 0 | |
| OTI (PITU) | airport | Indonesia | 2.05 | 128.32 | 49 | 0 | |
| OTIS ANGB | airport | United States | 41.66 | -70.52 | 131 | 0 | |
| OTIS HELISTOP DIVISION OF UTC | airport | United States | 41.71 | -72.80 | 362 | 0 | |
| OTJ (Otjiwarongo Airport) | airport | -20.43 | 16.66 | 4859 | 0 | ||
| OTK (TILLAMOOK) | airport | United States | 45.42 | -123.81 | 36 | 0 | |
| OTL (Boutilimit Airport) | airport | 17.53 | -14.68 | 121 | 0 | ||
| OTM (OTTUMWA INDUSTRIAL) | airport | United States | 41.11 | -92.45 | 845 | 0 | |
| OTN (ED-AIR) | airport | United States | 38.85 | -87.50 | 426 | 0 | |
| OTP (HENRI COANDA) | airport | Romania | 44.57 | 26.10 | 314 | 0 | |
| OTR (COTO 47) | airport | Costa Rica | 8.60 | -82.97 | 26 | 0 | |
| OTS (ANACORTES) | airport | United States | 48.50 | -122.66 | 241 | 0 | |
| OTT (Andre Maggi Airport) | airport | -9.90 | -58.58 | 900 | 0 | ||
| OTT FARMS | airport | United States | 34.40 | -102.45 | 3817 | 0 | |
| OTTAWA EXECUTIVE | airport | United States | 42.82 | -85.93 | 740 | 0 | |
| OTTAWA MACDONALD CARTIER INTL | airport | Canada | 45.32 | -75.67 | 374 | 0 | |
| OTTAWA MUNI | airport | United States | 38.54 | -95.25 | 966 | 0 | |
| OTTERBACH FARM | airport | United States | 41.57 | -89.17 | 840 | 0 | |
| OTTERY ST. MARY | city | Devon | United Kingdom | 50.75 | -3.27 | 830 | 16826 |
| OTTMAN LANDING | airport | United States | 44.59 | -92.26 | 1150 | 0 | |
| OTTO KAISER HOSPITAL | airport | United States | 28.85 | -97.88 | 395 | 0 | |
| OTTUMWA HOSPITAL | airport | United States | 41.03 | -92.39 | 845 | 0 | |
| OTTUMWA INDUSTRIAL | airport | United States | 41.11 | -92.45 | 845 | 0 | |
| OTU | airport | Colombia | 7.01 | -74.72 | 2060 | 0 | |
| OTU (OTU) | airport | Colombia | 7.01 | -74.72 | 2060 | 0 | |
| OTV (Ontong Java Atoll Airstrip) | airport | -5.51 | 159.53 | 10 | 0 | ||
| OTZ (RALPH WIEN MEM) | airport | United States | 66.88 | -162.60 | 11 | 0 |