| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| AO | city | Chiapas | Mexico | 14.90 | -92.25 | 830 | 35934 |
| AO Estacion | city | Chiapas | Mexico | 14.89 | -92.26 | 830 | 37145 |
| AOA (Aroa Airport) | airport | -9.03 | 146.80 | 20 | 0 | ||
| AOB (Annanberg Airport) | airport | -4.90 | 144.64 | 130 | 0 | ||
| AOC (ALTENBURG NOBITZ) | airport | Germany | 50.98 | 12.51 | 640 | 0 | |
| AOD (Abou-Deïa Airport) | airport | 11.48 | 19.29 | 1592 | 0 | ||
| AOE (ANADOLU) | airport | Turkey | 39.81 | 30.52 | 2588 | 0 | |
| AOG (Anshan Air Base) | airport | 41.11 | 122.85 | 0 | |||
| AOH (LIMA ALLEN CO) | airport | United States | 40.71 | -84.03 | 975 | 0 | |
| AOI (FALCONARA) | airport | Italy | 43.62 | 13.36 | 49 | 0 | |
| AOJ (AOMORI) | airport | Japan | 40.73 | 140.69 | 664 | 0 | |
| AOK (KARPATHOS) | airport | Greece | 35.42 | 27.15 | 66 | 0 | |
| AOL (PASO DE LOS LIBRES) | airport | Argentina | -29.69 | -57.15 | 230 | 0 | |
| AOM (Adam Airport) | airport | 22.49 | 57.38 | 1075 | 0 | ||
| AOMORI | airport | Japan | 40.73 | 140.69 | 664 | 0 | |
| AOO (ALTOONA BLAIR CO) | airport | United States | 40.30 | -78.32 | 1504 | 0 | |
| AOP (ALFEREZ VLADIMIR SARA BAUER) | airport | Peru | -2.80 | -76.47 | 728 | 0 | |
| AOR (SULTAN ABDUL HALIM) | airport | Malaysia | 6.19 | 100.40 | 15 | 0 | |
| AOS (AMOOK BAY) | airport | United States | 57.47 | -153.82 | 0 | 0 | |
| AOSTA | airport | Italy | 45.74 | 7.37 | 1791 | 0 | |
| AOT (AOSTA) | airport | Italy | 45.74 | 7.37 | 1791 | 0 | |
| AOU (Attopeu Airport) | airport | 14.81 | 106.82 | 344 | 0 |