| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Onon | city | Sud | Cameroon | 2.40 | 12.47 | 2047 | 596 |
| Onon | city | Dornod | Mongolia | 49.12 | 112.67 | 3349 | 0 |
| Onon | city | Hentiy | Mongolia | 48.62 | 110.60 | 3385 | 0 |
| Onon | city | Zabaykal'skiy Kray | Russia | 51.70 | 115.82 | 1679 | 745 |
| Onon | city | Zabaykal'skiy Kray | Russia | 50.98 | 115.57 | 1958 | 618 |
| Onon | city | Zabaykal'skiy Kray | Russia | 51.48 | 115.95 | 1758 | 727 |
| Onon | city | Zabaykal'skiy Kray | Russia | 51.71 | 115.81 | 1669 | 745 |
| Onon | city | Asturias | Spain | 43.50 | -5.40 | 830 | 5864 |
| Onon Borzia | city | Zabaykal'skiy Kray | Russia | 51.07 | 117.32 | 2851 | 149 |
| Onon-Boro | city | Kalmykiya | Russia | 47.38 | 46.17 | 13 | 149 |
| Onon-Borzya | city | Zabaykal'skiy Kray | Russia | 51.07 | 117.32 | 2851 | 149 |
| Ononamolo | city | Sumatera Utara | Indonesia | 1.13 | 97.37 | 164 | 3513 |
| Onondaga | city | Ontario | Canada | 43.12 | -80.12 | 830 | 1012 |
| Onondaga | city | Michigan | United States | 42.44 | -84.56 | 898 | |
| Onondaga Castle | city | New York | United States | 42.97 | -76.14 | 830 | |
| Onondaga Hill | city | New York | United States | 43.00 | -76.18 | 830 | |
| Onondowa | city | Sulawesi Selatan | Indonesia | -2.13 | 120.30 | 4189 | 382 |
| Onondowa/Rampi Airport | airport | -2.13 | 120.30 | 3230 | 0 | ||
| Ononebele | city | Equatorial Guinea | 1.03 | 10.03 | 830 | 1102 | |
| Ononebere | city | Equatorial Guinea | 1.79 | 11.25 | 1669 | 2297 | |
| Onong | city | Equatorial Guinea | 1.95 | 10.28 | 849 | 1043 | |
| Onongan | city | Jawa Timur | Indonesia | -7.14 | 113.33 | 255 | 109540 |
| Ononge | city | Central | Papua New Guinea | -8.57 | 147.25 | 5869 | 596 |
| Ononge Airport | airport | -8.67 | 147.26 | 5800 | 0 | ||
| Onongge | city | Central | Papua New Guinea | -8.57 | 147.25 | 5869 | 596 |
| Onongisuo | city | Rivers | Nigeria | 4.53 | 6.70 | 265 | 10887 |
| Onongoch | city | Chuuk | Federated States of Micronesia | 7.35 | 151.83 | 3 | 12935 |
| Onongoch | city | Federated States of Micronesia | United States | 7.35 | 151.82 | 3 | |
| Onongot | city | Chuuk | Federated States of Micronesia | 7.35 | 151.83 | 3 | 12935 |
| Ononguru | city | Palau | 7.70 | 134.62 | 3 | 234 | |
| Ononie | city | Katanga | Congo (Dem. Republic of The)-(Zaire) | 2.93 | 27.83 | 2716 | 4172 |
| Ononii | city | Fukushima | Japan | 37.29 | 140.63 | 1669 | 10430 |
| Ononjara | city | Sumatera Utara | Indonesia | 1.15 | 97.46 | 830 | 8690 |
| Onono | city | Anambra | Nigeria | 6.20 | 6.76 | 183 | 332810 |
| Onono | city | Puno | Peru | -15.62 | -70.58 | 13464 | 298 |
| Ononobere | city | Equatorial Guinea | 1.03 | 10.03 | 830 | 1102 | |
| Ononodjara | city | Sumatera Utara | Indonesia | 1.15 | 97.46 | 830 | 8690 |
| Ononofu | city | Delta | Nigeria | 5.61 | 6.59 | 180 | 19254 |
| Ononsenlu-Alako | city | Nigeria | 6.85 | 4.00 | 249 | 67876 | |
| Ononskoye | city | Zabaykal'skiy Kray | Russia | 50.98 | 115.57 | 1958 | 618 |
| Ononskoye | city | Zabaykal'skiy Kray | Russia | 51.48 | 115.95 | 1758 | 727 |