UpAlphabetical listing of Places in Vietnam
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| O Bap | city | Tra Vinh | Vietnam | 9.85 | 106.28 | 3 | 49480 |
| O Cach | city | Thanh Hoa | Vietnam | 19.55 | 105.78 | 36 | 64020 |
| O Chai | city | Quang Ngai | Vietnam | 14.82 | 108.56 | 830 | 5275 |
| O Chich | city | Tra Vinh | Vietnam | 9.92 | 106.27 | 3 | 55721 |
| O Cuong | city | Nghe An | Vietnam | 18.94 | 105.42 | 36 | 71359 |
| O Do | city | Bac Giang | Vietnam | 21.41 | 106.10 | 62 | 97001 |
| O Kep | city | Quang Ngai | Vietnam | 15.00 | 108.73 | 830 | 11174 |
| O Kha | city | Khanh Hoa | Vietnam | 12.05 | 108.98 | 3349 | 4321 |
| O Khon | city | Quang Nam | Vietnam | 15.47 | 108.06 | 843 | 8934 |
| O Lac | city | Tra Vinh | Vietnam | 9.73 | 106.48 | 3 | 47477 |
| O Lon | city | Tra Vinh | Vietnam | 9.85 | 106.31 | 3 | 49507 |
| O Lu | city | Ha Nam | Vietnam | 20.52 | 106.02 | 39 | 126717 |
| O Me | city | Thai Binh | Vietnam | 20.48 | 106.30 | 9 | 259570 |
| O Me | city | Ha Nam | Vietnam | 20.55 | 106.01 | 45 | 130031 |
| O Miet | city | Quang Ngai | Vietnam | 15.30 | 108.57 | 830 | 8410 |
| O Ngo | city | Gia Lai | Vietnam | 13.63 | 107.96 | 1669 | 11114 |
| O Nhuan | city | Quang Nam | Vietnam | 15.45 | 108.09 | 830 | 13557 |
| O Pou | city | Son La | Vietnam | 20.93 | 104.42 | 3349 | 9983 |
| O Qui Ho | city | Lao Cai | Vietnam | 22.37 | 103.79 | 5869 | 3663 |
| O Qui Ho | city | Lao Cai | Vietnam | 22.37 | 103.80 | 5869 | 3663 |
| O Qui Ho | city | Lao Cai | Vietnam | 22.37 | 103.80 | 5869 | 4175 |
| O Quy Ho | city | Lao Cai | Vietnam | 22.37 | 103.79 | 5869 | 3663 |
| O Rang | city | Tra Vinh | Vietnam | 9.76 | 106.44 | 3 | 51540 |
| O Rom | city | Tra Vinh | Vietnam | 9.88 | 106.11 | 3 | 56502 |
| O Tre Lon | city | Tra Vinh | Vietnam | 9.85 | 106.31 | 3 | 49507 |
| O Tre Nho | city | Tra Vinh | Vietnam | 9.83 | 106.32 | 3 | 51310 |
| O Vuc | city | Ha Noi | Vietnam | 20.85 | 105.73 | 91 | 185350 |
| Oa Giun | city | Quang Binh | Vietnam | 17.67 | 105.98 | 1669 | 10399 |
| Oai No | city | Hai Phong | Vietnam | 20.68 | 106.42 | 13 | 157858 |
| Oai No Thuong | city | Ha Noi | Vietnam | 21.13 | 105.85 | 72 | 196626 |
| Oai Vien | city | Ninh Binh | Vietnam | 20.37 | 105.82 | 39 | 95784 |
| Oan Det | city | Lao Cai | Vietnam | 22.72 | 104.10 | 1830 | 9100 |
| Oao Frong | city | Bac Kan | Vietnam | 22.48 | 106.10 | 1847 | 5727 |
| Observatoire de Phu Lien | city | Hai Phong | Vietnam | 20.82 | 106.63 | 167 | 551710 |
| Oe Iam | city | Son La | Vietnam | 20.82 | 104.45 | 3740 | 8679 |
| Ohy Nhan | city | Thai Binh | Vietnam | 20.35 | 106.37 | 3 | 85291 |
| Oi Noi | city | Hoa Binh | Vietnam | 20.80 | 105.13 | 948 | 7304 |
| Oiê Rù | city | Hoa Binh | Vietnam | 20.70 | 105.50 | 291 | 26671 |
| Omkir | city | Binh Thuan | Vietnam | 11.47 | 108.53 | 1194 | 7748 |
| On | city | Lang Son | Vietnam | 21.67 | 106.58 | 278 | 9424 |
| On Cau | city | Lang Son | Vietnam | 21.77 | 106.85 | 1669 | 9387 |
| On Dac | city | Tay Ninh | Vietnam | 11.62 | 106.33 | 160 | 14732 |
| On Huong | city | Quang Ngai | Vietnam | 14.83 | 108.75 | 226 | 8281 |
| On Luong Thuong | city | Thai Nguyen | Vietnam | 21.77 | 105.63 | 236 | 24736 |
| Ong Bau | city | Quang Ngai | Vietnam | 15.02 | 108.73 | 68 | 12005 |
| Ong Chai | city | Quang Ngai | Vietnam | 14.82 | 108.56 | 830 | 5275 |
| Ong Cho | city | Kon Tum | Vietnam | 14.87 | 108.25 | 3349 | 1341 |
| Ong Den | city | Ho Chi Minh | Vietnam | 10.84 | 106.71 | 45 | 1058211 |
| Ong Dinh | city | Ca Mau | Vietnam | 8.67 | 105.02 | 3 | 16560 |
| Ong Do | city | Thanh Hoa | Vietnam | 19.95 | 105.92 | 32 | 48847 |
| Ong Doi | city | Thanh Hoa | Vietnam | 19.95 | 105.92 | 32 | 48847 |
| Ong Don | city | Quang Ngai | Vietnam | 14.89 | 108.36 | 2509 | 1341 |
| Ong Hung | city | Tay Ninh | Vietnam | 11.27 | 106.27 | 114 | 42114 |
| Ong Keo | city | Dong Nai | Vietnam | 10.67 | 106.87 | 6 | 8889 |
| Ong Lam | city | Bac Ninh | Vietnam | 21.10 | 106.07 | 29 | 94137 |
| Ong Lang | city | Kien Giang | Vietnam | 10.26 | 103.94 | 85 | 9959 |
| Ong Muon | city | Ca Mau | Vietnam | 9.18 | 105.11 | 3 | 81377 |
| Ong Phit | city | | Vietnam | 10.07 | 105.37 | 6 | 49827 |
| Ong Tuong | city | Soc Trang | Vietnam | 9.38 | 106.14 | 3 | 35395 |
| Ong Yem | city | Binh Duong | Vietnam | 11.18 | 106.60 | 131 | 12963 |
| Ong Yen | city | Quang Ngai | Vietnam | 15.12 | 108.38 | 328 | 7450 |
| Ou Kai | city | Yen Bai | Vietnam | 21.78 | 104.45 | 1692 | 10010 |
| Ou Ko Tohou | city | Ha Giang | Vietnam | 22.75 | 104.65 | 2778 | 9089 |
| Ou Lai Po | city | Lao Cai | Vietnam | 22.68 | 104.08 | 1669 | 9115 |
| Ouang Duc | city | Thanh Hoa | Vietnam | 19.98 | 105.97 | 39 | 34753 |
| Ouang Huy | city | Son La | Vietnam | 21.25 | 104.77 | 984 | 9693 |
| Ouang Van | city | Binh Dinh | Vietnam | 13.83 | 109.20 | 6 | 162347 |
| Oue Mé | city | Son La | Vietnam | 21.23 | 104.25 | 2785 | 6152 |
| Ouei Bac | city | Lai Chau | Vietnam | 21.92 | 103.80 | 2529 | 12069 |
| Ouei Doun | city | Lai Chau | Vietnam | 22.00 | 103.80 | 1669 | 5945 |
| Ouei Hoa | city | Cao Bang | Vietnam | 22.70 | 105.85 | 4189 | 5760 |
| Ouei Hon | city | Lai Chau | Vietnam | 21.90 | 103.77 | 2828 | 12069 |
| Ouei Khouang | city | Lai Chau | Vietnam | 22.03 | 103.83 | 1781 | 4448 |
| Ouei Lan | city | Lai Chau | Vietnam | 22.05 | 103.85 | 2037 | 3746 |
| Ouei Lan | city | Lai Chau | Vietnam | 22.00 | 103.90 | 1807 | 9980 |
| Ouei Le | city | Lai Chau | Vietnam | 22.05 | 103.85 | 2037 | 3746 |
| Ouei Leup | city | Lai Chau | Vietnam | 21.98 | 103.82 | 2089 | 8783 |
| Ouei Lo | city | Lai Chau | Vietnam | 21.98 | 103.85 | 2509 | 9861 |
| Ouei Loc | city | | Vietnam | 21.70 | 103.87 | 2073 | 9894 |
| Ouei Lon | city | Lai Chau | Vietnam | 22.00 | 103.87 | 2509 | 8507 |
| Ouei Long | city | Son La | Vietnam | 21.65 | 103.88 | 830 | 7111 |
| Ouei Louan | city | Lai Chau | Vietnam | 21.97 | 103.82 | 2060 | 9514 |
| Ouei Lôh | city | Lai Chau | Vietnam | 22.00 | 103.87 | 2509 | 8507 |
| Ouei Quang | city | | Vietnam | 21.70 | 103.88 | 1669 | 9990 |
| Ouei San | city | Lai Chau | Vietnam | 22.07 | 103.87 | 2001 | 3393 |
| Oui Chu | city | Thanh Hoa | Vietnam | 19.88 | 105.78 | 45 | 141055 |
| Oui Dat | city | Quang Binh | Vietnam | 17.80 | 105.97 | 1082 | 8601 |
| Oui Mỹ | city | Thanh Hoa | Vietnam | 19.42 | 105.75 | 59 | 51813 |
| Ouri | city | Lai Chau | Vietnam | 22.68 | 103.38 | 5921 | 6407 |
| Ouuang | city | Lam Dong | Vietnam | 11.35 | 108.08 | 2509 | 12516 |
| Ouy Hau | city | Lang Son | Vietnam | 21.80 | 106.62 | 1669 | 10748 |
| Ouyet Tuy | city | Ha Tinh | Vietnam | 18.33 | 106.00 | 36 | 33183 |
| Ouynh Luu | city | Nghe An | Vietnam | 19.13 | 105.65 | 19 | 54158 |
| Oé Ian | city | Son La | Vietnam | 20.82 | 104.45 | 3740 | 8679 |
| Oửa Oải | city | Ha Giang | Vietnam | 22.97 | 105.15 | 2739 | 9440 |
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