| Station | Elevation | Latitude (DD) | Longitude (DD) |
| Oelwen | 3280 | +42683 | -091967 |
| Offutt afb/bellevue | 3191 | +41117 | -095917 |
| Ogallasearle fld | 9990 | +41117 | -101767 |
| Ogden airport | 13533 | +41183 | -112017 |
| Ogden hill aaf | 14630 | +41117 | -111983 |
| Ogden hill afb | 14591 | +41117 | -111967 |
| Ogden hinkley airport | 13625 | +41200 | -112017 |
| Ogden-hinckley muni | 13625 | +41200 | -112017 |
| Ogdensburg intl | 910 | +44683 | -075467 |
| Ogliuga alaska | 150 | +51550 | -178799 |
| Ohio st u/columbus | 2760 | +40083 | -083067 |
| Ok city nexrad | 3380 | +35333 | -097283 |
| Okinawa ryukyu is/bolo fld | 270 | +26400 | +127716 |
| Okinawa ryukyu is/drake fld | 750 | +26333 | +127783 |
| Okinawa ryukyu is/machinato a | 250 | +26249 | +127700 |
| Okinawa ryukyu is/yontan ab | 760 | +26383 | +127750 |
| Oklahoma city tinker aaf | 3840 | +35417 | -097383 |
| Oklahoma city tinker afb | 3840 | +35417 | -097383 |
| Oklahoma city will rogers fie | 3901 | +35400 | -097600 |
| Oklahoma city will rogers wor | 3975 | +35383 | -097600 |
| Oklahoma city/wiley | 3960 | +35533 | -097650 |
| Olathe johnson co industrial | 3313 | +38833 | -094883 |
| Olathe/johnson co. | 3340 | +38850 | -094733 |
| Old man | 3890 | +66450 | -150583 |
| Old town faa airport | 411 | +44950 | -068667 |
| Old town/dewitt fld | 390 | +44950 | -068667 |
| Olean municipal | 6510 | +42233 | -078367 |
| Oliktok (dew/awos) | 50 | +70500 | -149900 |
| Oliktok pow 2 | 49 | +70500 | -149883 |
| Olney-noble | 1470 | +38717 | -088183 |
| Olympia airport | 628 | +46967 | -122900 |
| Olympia municipal arpt | 661 | +46967 | -122900 |
| Omaha eppley airfield | 2993 | +41317 | -095900 |
| Omaha wsfo | 3990 | +41367 | -096017 |
| Omaha/valley | 3500 | +41317 | -096367 |
| Omak | 3820 | +48417 | -119533 |
| Ondal india | 860 | +23616 | +087200 |
| Oneonta | 3560 | +42517 | -075067 |
| Ontario | 3039 | +34067 | -117650 |
| Ontario airport | 6675 | +44017 | -117017 |
| Ontario municipal | 6675 | +44017 | -117017 |
| Ontario municipal ap | 6675 | +44017 | -117017 |
| Oracoke (cgs) | 20 | +35117 | -075983 |
| Orange (asos) | 1640 | +42567 | -072267 |
| Orange city | 4310 | +42983 | -096067 |
| Orange grove nalf | 780 | +27900 | -098050 |
| Orange municipal ap | 1692 | +42567 | -072283 |
| Orangeburg | 600 | +33467 | -080850 |
| Orangeburg municipal ap | 600 | +33467 | -080850 |
| Orbetello italy/mu 6 | 190 | +42433 | +011266 |
| Orchie lake yukon territory | 8190 | +62183 | -131749 |
| Ord/sharp field | 6310 | +41617 | -098950 |
| Oregon inlet (cgs) | 10 | +35767 | -075517 |
| Orlando | 320 | +28550 | -081333 |
| Orlando executive ap | 329 | +28550 | -081333 |
| Orlando herndon arpt | 329 | +28550 | -081333 |
| Orlando intl arpt | 293 | +28433 | -081333 |
| Orlando sanford airport | 168 | +28783 | -081250 |
| Orlando/herndon | 329 | +28550 | -081333 |
| Orlando/kissimmee | 250 | +28283 | -081433 |
| Oroville | 570 | +39500 | -121617 |
| Orr | 3970 | +48017 | -092867 |
| Ortonville | 3350 | +45300 | -096417 |
| Osceola | 2750 | +45317 | -092683 |
| Oscoda wurtsmith aaf | 1841 | +44467 | -083400 |
| Oscoda wurtsmith afb | 1881 | +44450 | -083400 |
| Oshkosh/wittman fld | 2460 | +43967 | -088550 |
| Oswego (cgs) | 780 | +43467 | -076517 |
| Ota japan/patton fld | 270 | +36266 | +139416 |
| Otis angb | 400 | +41650 | -070517 |
| Otto faa ap | 19001 | +35083 | -106017 |
| Ottumwa industrial ap | 2566 | +41100 | -092450 |
| Ottumwa nas | 2579 | +41100 | -092433 |
| Oua tom new caledonia | 370 | -21816 | +165866 |
| Oudna tunisia/mu 18 | 530 | +36633 | +010100 |
| Owatonna (awos) | 3500 | +44117 | -093250 |
| Owensboro/daviess | 1240 | +37733 | -087167 |
| Owi i netherlands new guinea | 230 | -01233 | +136200 |
| Owl`s head (ls) | 150 | +44083 | -069033 |
| Owyhee | 16450 | +41950 | -116100 |
| Oxford (awos) | 2220 | +41483 | -073133 |
| Oxford university | 1370 | +34383 | -089533 |
| Oxnard | 110 | +34200 | -119200 |
| Oxnard aaf | 201 | +34217 | -119083 |
| Oxnard airport | 110 | +34200 | -119200 |
| Oxnard/channel isl | 20 | +34167 | -119217 |
| O`neill/baker field | 6190 | +42467 | -098683 |
| Pacific beach | 180 | +47217 | -124200 |
| Pacific beach nf | 180 | +47217 | -124200 |
| Pacific buoy | 0 | +39200 | -124000 |
| Pacific city state | 20 | +45200 | -123967 |
| Pacora panama lajoya | 480 | +09133 | -079233 |
| Padloping island nwt dot | 400 | +67100 | -062350 |
| Paducah barkley field | 1225 | +37067 | -088767 |
| Paducah barkley regional ap | 1241 | +37050 | -088767 |
| Page mtn (awos) & | 8110 | +34683 | -094617 |
| Page muni (amos) | 13040 | +36933 | -111450 |
| Page muni (amos) & | 13140 | +36933 | -111450 |
| Pahala-on-hawaii | 0 | +19200 | -155483 |
| Palacios municipal ap | 49 | +28717 | -096250 |
| Palestine texas wbo | 1550 | -31750 | -095666 |
| Palm springs rgnl | 1410 | +33833 | -116500 |
| Palm springs thermal ap | -341 | +33633 | -116167 |
| Palmdale airport | 7693 | +34633 | -118083 |
| Palmdale production | 7693 | +34633 | -118083 |
| Palmer municipal | 710 | +61600 | -149083 |
| Palo alto airport | 20 | +37467 | -122117 |
| Palo pinto dempsey af | 3591 | +32783 | -098267 |
| Palo pinto texas/dempsey hpt | 3540 | +32800 | -098266 |
| Pampa | 9851 | +35533 | -100967 |
| Pampa texas aaf | 9550 | +35533 | -100750 |
| Panama city/bay co. | 60 | +30217 | -085683 |
| Pandaveswar india | 870 | +23716 | +087283 |
| Pantanella italy | 2260 | +41100 | +015933 |
| Paris/cox field | 1670 | +33633 | -095450 |
| Park falls muni | 4690 | +45933 | -090450 |
| Park place 1 nw wb | 5910 | +40850 | -076117 |
| Park rapids municipal ap | 4371 | +46900 | -095067 |
| Park ridge af | 2030 | +41983 | -087900 |
| Parkersburg wood county ap | 2533 | +39350 | -081433 |
United states of america (US)