| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| ORAMA-IAYUYA | airport | United States | 18.21 | -66.63 | 1463 | 0 | |
| ORANGE CITY MUNI | airport | United States | 42.99 | -96.06 | 1414 | 0 | |
| ORANGE CO | airport | United States | 30.07 | -93.80 | 13 | 0 | |
| ORANGE CO | airport | United States | 38.25 | -78.05 | 465 | 0 | |
| ORANGE CO | airport | United States | 41.51 | -74.26 | 365 | 0 | |
| ORANGE CO SHERIFFS FORENSICS LAB HELISTOP | airport | United States | 33.75 | -117.88 | 223 | 0 | |
| ORANGE COUNTY SHERIFF'S OFFICE | airport | United States | 28.51 | -81.41 | 98 | 0 | |
| ORANGE COUNTY STEEL SALVAGE | airport | United States | 33.85 | -117.85 | 230 | 0 | |
| ORANGE GROVE NALF | airport | United States | 27.90 | -98.05 | 257 | 0 | |
| ORANGE HILL | airport | United States | 30.66 | -85.53 | 260 | 0 | |
| ORANGE MUNI | airport | United States | 42.57 | -72.29 | 555 | 0 | |
| ORANGE POULTRY FARM | airport | United States | 41.33 | -74.32 | 420 | 0 | |
| ORANGEBURG MUNI | airport | United States | 33.46 | -80.86 | 195 | 0 | |
| ORBIT | airport | United States | 45.57 | -122.32 | 22 | 0 | |
| ORCAS ISLAND | airport | United States | 48.71 | -122.91 | 31 | 0 | |
| ORCHARD RANCH | airport | United States | 43.62 | -107.41 | 5277 | 0 | |
| ORD (CHICAGO OHARE INTL) | airport | United States | 41.98 | -87.90 | 668 | 0 | |
| ORD MOUNTAIN | airport | United States | 34.67 | -116.81 | 6120 | 0 | |
| ORECK | airport | United States | 30.78 | -89.73 | 180 | 0 | |
| OREGON HEALTH SCIENCES UNIVERSITY EMERG | airport | United States | 45.50 | -122.69 | 540 | 0 | |
| OREGON SKY RANCH | airport | United States | 45.88 | -118.41 | 1357 | 0 | |
| ORF (NORFOLK INTL) | airport | United States | 36.89 | -76.20 | 26 | 0 | |
| ORH (WORCESTER RGNL) | airport | United States | 42.27 | -71.88 | 1009 | 0 | |
| ORI (PORT LIONS) | airport | United States | 57.89 | -152.85 | 52 | 0 | |
| ORL (EXECUTIVE) | airport | United States | 28.55 | -81.33 | 113 | 0 | |
| ORLANDO APOPKA | airport | United States | 28.71 | -81.58 | 143 | 0 | |
| ORLANDO HYATT HOUSE | airport | United States | 28.33 | -81.53 | 90 | 0 | |
| ORLANDO INTL | airport | United States | 28.43 | -81.31 | 96 | 0 | |
| ORLANDO NORTH AIRPARK | airport | United States | 28.73 | -81.65 | 80 | 0 | |
| ORLANDO RGNL MEDICAL CENTER | airport | United States | 28.53 | -81.38 | 157 | 0 | |
| ORLANDO SANFORD INTL | airport | United States | 28.78 | -81.24 | 55 | 0 | |
| ORLEANS | airport | United States | 38.66 | -86.44 | 655 | 0 | |
| ORMOND BEACH MUNI | airport | United States | 29.30 | -81.11 | 29 | 0 | |
| OROCOVIS HEALTH CENTER | airport | United States | 18.23 | -66.39 | 1717 | 0 | |
| OROFINO MUNI | airport | United States | 46.49 | -116.28 | 1005 | 0 | |
| OROGRANDE | airport | United States | 45.73 | -115.53 | 4405 | 0 | |
| OROVILLE MUNI | airport | United States | 39.49 | -121.62 | 192 | 0 | |
| ORR | airport | United States | 42.38 | -102.44 | 3827 | 0 | |
| ORR FIELD | airport | United States | 41.18 | -100.86 | 2860 | 0 | |
| ORR RANCH | airport | United States | 42.39 | -102.58 | 3880 | 0 | |
| ORR RGNL | airport | United States | 48.02 | -92.86 | 1311 | 0 | |
| ORSON FIELD | airport | United States | 41.84 | -75.44 | 2100 | 0 | |
| ORT (NORTHWAY) | airport | United States | 62.96 | -141.93 | 1716 | 0 | |
| ORTHODONTIC STRIP | airport | United States | 41.59 | -86.90 | 805 | 0 | |
| ORTONVILLE MUNI MARTINSON FLD | airport | United States | 45.31 | -96.42 | 1100 | 0 | |
| ORUM AERODROME | airport | United States | 41.54 | -96.27 | 1320 | 0 | |
| ORV (ROBERT/BOB/CURTIS MEMORIAL) | airport | United States | 66.82 | -161.02 | 55 | 0 |