| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| O-erh-t'e-ni-chao | city | Ovorhangay | Mongolia | 47.22 | 102.77 | 5869 | 149 |
| O-erh-t’e-ni-chao | city | Ovorhangay | Mongolia | 47.22 | 102.77 | 5869 | 149 |
| OElgiy | city | Bayan-Olgiy | Mongolia | 48.97 | 89.96 | 5869 | 39190 |
| OEndoerhoshuu | city | Dornod | Mongolia | 48.00 | 113.93 | 2568 | 0 |
| Obo Khid | city | Suhbaatar | Mongolia | 45.30 | 113.90 | 4189 | 0 |
| Oboni-bulungiin dugang | city | Arhangay | Mongolia | 48.08 | 99.27 | 7086 | 149 |
| Oboo Hiid | city | Suhbaatar | Mongolia | 45.30 | 113.90 | 4189 | 0 |
| Oboonii Bulangiin Dugang | city | Arhangay | Mongolia | 48.08 | 99.27 | 7086 | 149 |
| Obooto Hural | city | Omnogovi | Mongolia | 42.97 | 101.50 | 5072 | 0 |
| Obootuin hural | city | Omnogovi | Mongolia | 42.97 | 101.50 | 5072 | 0 |
| Obor Gurbaiin Hiid | city | Tov | Mongolia | 46.60 | 107.18 | 4251 | 149 |
| Obor Hangayin | city | Ovorhangay | Mongolia | 46.26 | 102.78 | 5964 | 20443 |
| Obor Ulaan Haylan | city | Dornogovi | Mongolia | 46.08 | 110.17 | 3661 | 0 |
| Obor Urtaiin Ortoo | city | Dornod | Mongolia | 47.58 | 114.08 | 3349 | 0 |
| Obor-Gurbaiin-Hiyd | city | Tov | Mongolia | 46.60 | 107.18 | 4251 | 149 |
| Obotu Khural | city | Omnogovi | Mongolia | 42.97 | 101.50 | 5072 | 0 |
| Obotuin-khure | city | Omnogovi | Mongolia | 42.97 | 101.50 | 5072 | 0 |
| Obotuyn-Khural | city | Omnogovi | Mongolia | 42.97 | 101.50 | 5072 | 0 |
| Ochir Uaniin Dugan | city | Arhangay | Mongolia | 48.07 | 101.03 | 5869 | 149 |
| Ochir Wangiin Dugang | city | Arhangay | Mongolia | 48.07 | 101.03 | 5869 | 149 |
| Ochir-Wangiin-Dugan | city | Arhangay | Mongolia | 48.07 | 101.03 | 5869 | 149 |
| Ochirvanyin dugang | city | Arhangay | Mongolia | 48.07 | 101.03 | 5869 | 149 |
| Ochirvanyyn dugang | city | Arhangay | Mongolia | 48.07 | 101.03 | 5869 | 149 |
| Ochzhiman khural | city | Omnogovi | Mongolia | 43.20 | 100.72 | 6853 | 0 |
| Ochzhimin khural | city | Omnogovi | Mongolia | 43.20 | 100.72 | 6853 | 0 |
| Odhan Hayrhan | city | Dzavhan | Mongolia | 47.18 | 97.55 | 8389 | 0 |
| Odhon Hayrhan Suma | city | Dzavhan | Mongolia | 47.18 | 97.55 | 8389 | 0 |
| Odkhan Khairkhan | city | Dzavhan | Mongolia | 47.18 | 97.55 | 8389 | 0 |
| Odkhan Khayrkhan Somon | city | Dzavhan | Mongolia | 47.18 | 97.55 | 8389 | 0 |
| Ogiy | city | Arhangay | Mongolia | 47.78 | 102.68 | 4373 | 149 |
| Ogiynuur | city | Arhangay | Mongolia | 47.65 | 102.57 | 4445 | 149 |
| Ogomoriyn-Hudag | city | Tov | Mongolia | 46.83 | 107.78 | 4219 | 149 |
| Ogoomor | city | Omnogovi | Mongolia | 43.79 | 104.50 | 5029 | 0 |
| Ogoomoriin Bayshin | city | Govi-Altay | Mongolia | 46.02 | 95.08 | 4189 | 0 |
| Ogoomoriin Bayshing | city | Govi-Altay | Mongolia | 46.02 | 95.08 | 4189 | 0 |
| Ogoomoriin Hiid | city | Suhbaatar | Mongolia | 45.55 | 112.20 | 3349 | 0 |
| Ogorhon Hiid | city | Tov | Mongolia | 46.78 | 104.78 | 5055 | 149 |
| Ogorhon-Hiyd | city | Tov | Mongolia | 46.78 | 104.78 | 5055 | 149 |
| Oigor | city | Bayan-Olgiy | Mongolia | 49.17 | 89.28 | 5961 | 149 |
| Ojiman-Hural | city | Omnogovi | Mongolia | 43.20 | 100.72 | 6853 | 0 |
| Ojimin Hural | city | Omnogovi | Mongolia | 43.20 | 100.72 | 6853 | 0 |
| Okomur | city | Tov | Mongolia | 46.98 | 107.98 | 4461 | 149 |
| Okutuin-hito | city | Dornod | Mongolia | 49.30 | 113.78 | 3349 | 0 |
| Oldahu Hiid | city | Dundgovi | Mongolia | 44.82 | 105.40 | 4189 | 0 |
| Oldakhu Khid | city | Dundgovi | Mongolia | 44.82 | 105.40 | 4189 | 0 |
| Oldao Khid | city | Dundgovi | Mongolia | 44.82 | 105.40 | 4189 | 0 |
| Oldoh | city | Dundgovi | Mongolia | 44.82 | 105.40 | 4189 | 0 |
| Oldoho Hiid | city | Dundgovi | Mongolia | 44.82 | 105.40 | 4189 | 0 |
| Oldzey Delgerehe | city | Dundgovi | Mongolia | 45.53 | 104.52 | 4589 | 0 |
| Oldzeyte | city | Ovorhangay | Mongolia | 46.65 | 103.32 | 5869 | 149 |
| Oldzeyte | city | Suhbaatar | Mongolia | 46.40 | 111.62 | 3349 | 0 |
| Oldzeyte | city | Dundgovi | Mongolia | 44.40 | 106.30 | 4228 | 0 |
| Oldzeyte | city | Arhangay | Mongolia | 48.10 | 102.55 | 4268 | 149 |
| Oldzeyte Hural | city | Dornogovi | Mongolia | 43.58 | 109.05 | 2831 | 0 |
| Oldzeytu | city | Bayanhongor | Mongolia | 46.08 | 100.83 | 6276 | 0 |
| Oldzeytu | city | Ovorhangay | Mongolia | 46.65 | 103.32 | 5869 | 149 |
| Oldzeytu | city | Dundgovi | Mongolia | 44.40 | 106.30 | 4228 | 0 |
| Oldziit | city | Ovorhangay | Mongolia | 46.65 | 103.32 | 5869 | 149 |
| Oldziit | city | Arhangay | Mongolia | 48.10 | 102.55 | 4268 | 149 |
| Oldzit | city | Dundgovi | Mongolia | 45.30 | 106.20 | 4189 | 0 |
| Oldziyt | city | Bayanhongor | Mongolia | 46.08 | 100.83 | 6276 | 0 |
| Oldziyt | city | Arhangay | Mongolia | 48.54 | 101.37 | 5029 | 149 |
| Oldziyt | city | Dornogovi | Mongolia | 44.68 | 109.02 | 4189 | 0 |
| Olgii | city | Bayan-Olgiy | Mongolia | 48.97 | 89.96 | 5869 | 39190 |
| Olgii | city | Uvs | Mongolia | 49.03 | 92.03 | 5232 | 149 |
| Olgiy | city | Bayan-Olgiy | Mongolia | 48.97 | 89.96 | 5869 | 39190 |
| Olgiy | city | Uvs | Mongolia | 49.03 | 92.03 | 5232 | 149 |
| Ologey | city | Bayan-Olgiy | Mongolia | 48.97 | 89.96 | 5869 | 39190 |
| Olon Baishin | city | Dornod | Mongolia | 48.07 | 113.82 | 2637 | 0 |
| Olon Bayshin | city | Dornod | Mongolia | 48.07 | 113.82 | 2637 | 0 |
| Olon Bayshing | city | Dornod | Mongolia | 48.07 | 113.82 | 2637 | 0 |
| Olon Bulagiin Bayshin | city | Bayanhongor | Mongolia | 46.53 | 98.62 | 7778 | 0 |
| Olon Bulagiin Bayshing | city | Bayanhongor | Mongolia | 46.53 | 98.62 | 7778 | 0 |
| Olon Huryee | city | Dornogovi | Mongolia | 44.57 | 109.00 | 3710 | 0 |
| Olon Khure | city | Dornogovi | Mongolia | 44.57 | 109.00 | 3710 | 0 |
| Olon Shandanii Jisa | city | Tov | Mongolia | 47.18 | 106.30 | 4616 | 149 |
| Olon Turagiin Dugang | city | Arhangay | Mongolia | 48.15 | 101.23 | 5869 | 149 |
| Olon shandanyy chzhisa | city | Tov | Mongolia | 47.18 | 106.30 | 4616 | 149 |
| Olon shandanöy chzhisa | city | Tov | Mongolia | 47.18 | 106.30 | 4616 | 149 |
| Olon-Turagiin-Dugan | city | Arhangay | Mongolia | 48.15 | 101.23 | 5869 | 149 |
| Olon-Turugin dugang | city | Arhangay | Mongolia | 48.15 | 101.23 | 5869 | 149 |
| Omnogovi | city | Uvs | Mongolia | 49.10 | 91.72 | 5282 | 149 |
| Omnogow' | city | Uvs | Mongolia | 49.10 | 91.72 | 5282 | 149 |
| Omolgon Baatar | city | Ulaanbaatar | Mongolia | 47.90 | 107.00 | 4271 | 128947 |
| Omono Delger Suma | city | Hentiy | Mongolia | 47.87 | 109.92 | 4317 | 0 |
| Omono Gobi Sume | city | Uvs | Mongolia | 49.10 | 91.72 | 5282 | 149 |
| Ondon-Ulan | city | Arhangay | Mongolia | 48.05 | 100.51 | 6709 | 149 |
| Ondor Gegeenii Hiid | city | Selenge | Mongolia | 49.50 | 105.10 | 3697 | 149 |
| Ondor Hangay Suma | city | Uvs | Mongolia | 49.27 | 94.85 | 6164 | 149 |
| Ondor Shili Suma | city | Dundgovi | Mongolia | 45.25 | 108.28 | 4189 | 0 |
| Ondor Ulaan Suma | city | Arhangay | Mongolia | 48.05 | 100.51 | 6709 | 149 |
| Ondor hurme | city | Omnogovi | Mongolia | 43.31 | 104.08 | 5967 | 0 |
| Ondor untsa | city | Ovorhangay | Mongolia | 45.85 | 103.18 | 5029 | 149 |
| Ondor-Gregeenii-Hiyd | city | Selenge | Mongolia | 49.50 | 105.10 | 3697 | 149 |
| Ondor-Onts | city | Ovorhangay | Mongolia | 45.85 | 103.18 | 5029 | 149 |
| Ondorhangay-Sum | city | Uvs | Mongolia | 49.68 | 95.07 | 4514 | 149 |
| Ondorkhaan | city | Hentiy | Mongolia | 47.32 | 110.66 | 3418 | 2053 |
| Ondorkhangai | city | Uvs | Mongolia | 49.27 | 94.85 | 6164 | 149 |
| Ondorshireet | city | Tov | Mongolia | 47.42 | 104.82 | 4189 | 149 |
| Ongi | city | Ovorhangay | Mongolia | 46.47 | 102.28 | 6709 | 149 |
| Ongi | city | Dundgovi | Mongolia | 45.45 | 103.90 | 4255 | 0 |
| Ongi Suma | city | Ovorhangay | Mongolia | 46.47 | 102.28 | 6709 | 149 |
| Ongi sumu | city | Ovorhangay | Mongolia | 46.47 | 102.28 | 6709 | 149 |
| Ongiim Sume | city | Ovorhangay | Mongolia | 45.97 | 103.27 | 5049 | 149 |
| Ongiin | city | Ovorhangay | Mongolia | 45.97 | 103.27 | 5049 | 149 |
| Ongiin Hiid | city | Ovorhangay | Mongolia | 45.97 | 103.27 | 5049 | 149 |
| Ongin | city | Ovorhangay | Mongolia | 45.97 | 103.27 | 5049 | 149 |
| Ongin | city | Ovorhangay | Mongolia | 46.47 | 102.28 | 6709 | 149 |
| Ongoin Khid | city | Ovorhangay | Mongolia | 45.97 | 103.27 | 5049 | 149 |
| Ongon | city | Selenge | Mongolia | 48.92 | 105.08 | 2791 | 149 |
| Ongon | city | Ovorhangay | Mongolia | 46.97 | 103.78 | 5029 | 149 |
| Ongon | city | Suhbaatar | Mongolia | 45.67 | 113.08 | 3605 | 0 |
| Ongon Elesu | city | Suhbaatar | Mongolia | 45.67 | 113.08 | 3605 | 0 |
| Ongon Somon | city | Suhbaatar | Mongolia | 45.67 | 113.08 | 3605 | 0 |
| Ongon Suma | city | Suhbaatar | Mongolia | 45.67 | 113.08 | 3605 | 0 |
| Ongon Suma Elesete | city | Suhbaatar | Mongolia | 45.67 | 113.08 | 3605 | 0 |
| Ongon sumu | city | Suhbaatar | Mongolia | 45.67 | 113.08 | 3605 | 0 |
| Ongyin khid | city | Ovorhangay | Mongolia | 45.97 | 103.27 | 5049 | 149 |
| Ongyyn khid | city | Ovorhangay | Mongolia | 45.97 | 103.27 | 5049 | 149 |
| Ongöyn khid | city | Ovorhangay | Mongolia | 45.97 | 103.27 | 5049 | 149 |
| Onjuul | city | Tov | Mongolia | 46.78 | 105.57 | 5029 | 149 |
| Onjuul Suma | city | Tov | Mongolia | 46.78 | 105.57 | 5029 | 149 |
| Onon | city | Dornod | Mongolia | 49.12 | 112.67 | 3349 | 0 |
| Onon | city | Hentiy | Mongolia | 48.62 | 110.60 | 3385 | 0 |
| Ordogoiin Dugang | city | Bulgan | Mongolia | 49.83 | 103.47 | 4225 | 0 |
| Ordogoin dugang | city | Bulgan | Mongolia | 49.83 | 103.47 | 4225 | 0 |
| Orgil | city | Hovsgol | Mongolia | 48.59 | 99.35 | 5200 | 149 |
| Orgil | city | Tov | Mongolia | 48.42 | 105.33 | 3713 | 149 |
| Orgon | city | Bayanhongor | Mongolia | 44.73 | 100.37 | 5075 | 0 |
| Orgon Shirigiin Huryee | city | Dzavhan | Mongolia | 47.23 | 97.28 | 7769 | 0 |
| Orhirogiin Dugang | city | Selenge | Mongolia | 48.95 | 106.58 | 3471 | 149 |
| Orhirogin-Dugan | city | Selenge | Mongolia | 48.95 | 106.58 | 3471 | 149 |
| Orhiroogiin Dugan | city | Selenge | Mongolia | 48.95 | 106.58 | 3471 | 149 |
| Orhon | city | Selenge | Mongolia | 49.15 | 105.39 | 2509 | 149 |
| Orhon | city | Bulgan | Mongolia | 48.63 | 103.53 | 3559 | 0 |
| Orhon | city | Darhan-Uul | Mongolia | 49.83 | 106.14 | 2096 | 1024 |
| Orhon Tuula Suma | city | Selenge | Mongolia | 48.95 | 104.98 | 2509 | 149 |
| Orhontuul | city | Selenge | Mongolia | 48.95 | 104.98 | 2509 | 149 |
| Orkhirogin dugang | city | Selenge | Mongolia | 48.95 | 106.58 | 3471 | 149 |
| Orkhon | city | Selenge | Mongolia | 49.15 | 105.39 | 2509 | 149 |
| Orkhon | city | Bulgan | Mongolia | 48.63 | 103.53 | 3559 | 0 |
| Orkhon | city | Darhan-Uul | Mongolia | 49.83 | 106.14 | 2096 | 1024 |
| Orkhon-Tola | city | Selenge | Mongolia | 48.95 | 104.98 | 2509 | 149 |
| Orkhontola Somon | city | Selenge | Mongolia | 48.95 | 104.98 | 2509 | 149 |
| Orkhontuul | city | Selenge | Mongolia | 48.95 | 104.98 | 2509 | 149 |
| Ortoogiin Dugang | city | Bayanhongor | Mongolia | 46.12 | 100.80 | 6220 | 0 |
| Ortoon Shuteen | city | Hentiy | Mongolia | 47.58 | 109.40 | 5029 | 0 |
| Ortsog Khural | city | Dornogovi | Mongolia | 44.75 | 108.37 | 3671 | 0 |
| Orudofu-hito | city | Dundgovi | Mongolia | 44.82 | 105.40 | 4189 | 0 |
| Otgon | city | Dzavhan | Mongolia | 47.18 | 97.55 | 8389 | 0 |
| Otgon-khayrkhan | city | Dzavhan | Mongolia | 47.18 | 97.55 | 8389 | 0 |
| Othan | city | Dzavhan | Mongolia | 47.18 | 97.55 | 8389 | 0 |
| Othan sumu | city | Dzavhan | Mongolia | 47.18 | 97.55 | 8389 | 0 |
| Otochin Dugang | city | Arhangay | Mongolia | 48.45 | 100.28 | 6220 | 149 |
| Otochin-Dugan | city | Arhangay | Mongolia | 48.45 | 100.28 | 6220 | 149 |
| Oulan-Bator | city | Ulaanbaatar | Mongolia | 47.92 | 106.92 | 4215 | 154220 |
| Oulan-Batò | city | Ulaanbaatar | Mongolia | 47.92 | 106.92 | 4215 | 154220 |
| Ouliastaï | city | Dzavhan | Mongolia | 47.74 | 96.84 | 5869 | 25911 |
| Ourga | city | Ulaanbaatar | Mongolia | 47.92 | 106.92 | 4215 | 154220 |
| Ovgodiy | city | Dzavhan | Mongolia | 48.64 | 97.62 | 5948 | 0 |
| Ovoot | city | Govi-Altay | Mongolia | 46.60 | 94.83 | 5249 | 0 |
| Ovoot | city | Suhbaatar | Mongolia | 45.30 | 113.87 | 4189 | 0 |
| Ovor-Ereen | city | Dornod | Mongolia | 49.27 | 112.48 | 3431 | 0 |
| Owoot | city | Govi-Altay | Mongolia | 46.60 | 94.83 | 5249 | 0 |
| Oygon | city | Dzavhan | Mongolia | 49.00 | 96.55 | 5869 | 0 |
| Oygor | city | Bayan-Olgiy | Mongolia | 49.17 | 89.28 | 5961 | 149 |