| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| OAJ (ALBERT J ELLIS) | airport | United States | 34.83 | -77.61 | 94 | 0 | |
| OAK (METROPOLITAN OAKLAND INTL) | airport | United States | 37.72 | -122.22 | 9 | 0 | |
| OAK COUNTRY RANCH | airport | United States | 35.57 | -120.80 | 1200 | 0 | |
| OAK GLEN RANCH | airport | United States | 33.38 | -95.60 | 430 | 0 | |
| OAK GROVE MCOLF | airport | United States | 35.03 | -77.25 | 27 | 0 | |
| OAK HARBOR | airport | United States | 28.13 | -81.69 | 130 | 0 | |
| OAK HILL HOSPITAL | airport | United States | 38.90 | -82.58 | 730 | 0 | |
| OAK LAKE AIR STRIP | airport | United States | 47.66 | -95.95 | 1204 | 0 | |
| OAK LANDING | airport | United States | 42.30 | -88.38 | 870 | 0 | |
| OAK RIDGE | airport | United States | 43.10 | -77.18 | 540 | 0 | |
| OAK RIDGE | airport | United States | 27.86 | -97.20 | 20 | 0 | |
| OAK RIDGE FARMS | airport | United States | 39.98 | -92.86 | 995 | 0 | |
| OAK RIDGE PLANTATION | airport | United States | 31.37 | -83.75 | 350 | 0 | |
| OAK TREE LANDING | airport | United States | 29.72 | -82.67 | 90 | 0 | |
| OAKBROOK | airport | United States | 42.89 | -88.81 | 840 | 0 | |
| OAKDALE | airport | United States | 37.76 | -120.80 | 234 | 0 | |
| OAKDALE AHP | airport | United States | 40.39 | -80.16 | 1265 | 0 | |
| OAKES FIELD | airport | United States | 39.79 | -85.64 | 935 | 0 | |
| OAKES MUNI | airport | United States | 46.17 | -98.08 | 1335 | 0 | |
| OAKESDALE | airport | United States | 47.14 | -117.24 | 2680 | 0 | |
| OAKHILL AIRPARK | airport | United States | 34.59 | -82.35 | 837 | 0 | |
| OAKLAND CO INTL | airport | United States | 42.67 | -83.42 | 980 | 0 | |
| OAKLAND CONVENTION CENTER | airport | United States | 37.80 | -122.27 | 110 | 0 | |
| OAKLAND SOUTHWEST | airport | United States | 42.50 | -83.62 | 926 | 0 | |
| OAKLAND TROY | airport | United States | 42.54 | -83.18 | 729 | 0 | |
| OAKLEAF | airport | United States | 43.58 | -96.95 | 1625 | 0 | |
| OAKLEY | airport | United States | 36.17 | -86.96 | 400 | 0 | |
| OAKLEY MUNI | airport | United States | 42.23 | -113.88 | 4650 | 0 | |
| OAKLEY MUNI | airport | United States | 39.11 | -100.82 | 3045 | 0 | |
| OAKRIDGE STATE | airport | United States | 43.75 | -122.50 | 1393 | 0 | |
| OAKS | airport | United States | 32.28 | -95.08 | 510 | 0 | |
| OAKS HELISTOP | airport | United States | 27.21 | -82.49 | 14 | 0 | |
| OAKVIEW | airport | United States | 34.81 | -82.82 | 1040 | 0 | |
| OAKWOOD HOSPITAL | airport | United States | 42.29 | -83.21 | 597 | 0 | |
| OAR (MARINA MUNI) | airport | United States | 36.68 | -121.76 | 134 | 0 | |
| OASIS RANGER STATION-U.S. GOVERNMENT | airport | United States | 25.86 | -81.03 | 10 | 0 |