| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| OSAGE CITY MUNI | airport | United States | 38.63 | -95.80 | 1105 | 0 | |
| OSAGE MUNI | airport | United States | 43.29 | -92.80 | 1168 | 0 | |
| OSBORN AIRFIELD | airport | United States | 28.53 | -81.87 | 121 | 0 | |
| OSBORNE | airport | United States | 34.58 | -117.27 | 2900 | 0 | |
| OSBORNE MUNI | airport | United States | 39.43 | -98.68 | 1565 | 0 | |
| OSC (OSCODA WURTSMITH) | airport | United States | 44.45 | -83.39 | 634 | 0 | |
| OSCEOLA COMMUNITY HOSPITAL | airport | United States | 43.41 | -95.74 | 1537 | 0 | |
| OSCEOLA MUNI | airport | United States | 38.02 | -93.69 | 900 | 0 | |
| OSCEOLA MUNI | airport | United States | 35.69 | -90.01 | 234 | 0 | |
| OSCEOLA MUNI | airport | United States | 41.05 | -93.69 | 1110 | 0 | |
| OSCEOLA RGNL HOSPITAL | airport | United States | 28.30 | -81.41 | 59 | 0 | |
| OSCEOLA SHERIFF'S OFC - BRONSON HWY | airport | United States | 28.28 | -81.34 | 66 | 0 | |
| OSCODA COUNTY | airport | United States | 44.68 | -84.13 | 1050 | 0 | |
| OSCODA WURTSMITH | airport | United States | 44.45 | -83.39 | 634 | 0 | |
| OSCURA AAF AUX | airport | United States | 33.49 | -106.18 | 4500 | 0 | |
| OSF FAMILY MEDICAL CENTER | airport | United States | 40.92 | -90.66 | 760 | 0 | |
| OSF SAINT FRANCIS MEDICAL CENTER | airport | United States | 40.70 | -89.59 | 585 | 0 | |
| OSH (WITTMAN RGNL) | airport | United States | 43.98 | -88.56 | 808 | 0 | |
| OSHKOSH SKY RANCH | airport | United States | 44.02 | -88.71 | 770 | 0 | |
| OSKALOOSA MUNI | airport | United States | 41.23 | -92.49 | 840 | 0 | |
| OSO CANYON | airport | United States | 30.02 | -101.55 | 1820 | 0 | |
| OSSIPORT | airport | United States | 30.32 | -97.87 | 818 | 0 | |
| OSTERMAN | airport | United States | 40.49 | -74.74 | 200 | 0 | |
| OSU (OHIO STATE UNIVERSITY) | airport | United States | 40.08 | -83.07 | 905 | 0 | |
| OSWEGO CO | airport | United States | 43.35 | -76.39 | 475 | 0 | |
| OSWEGO COUNTY AT PULASKI | airport | United States | 43.55 | -76.09 | 445 | 0 | |
| OSWEGO MUNI | airport | United States | 37.16 | -95.04 | 830 | 0 |