| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Odae | city | Ulsan | Korea, Republic of (South) | 35.48 | 129.32 | 0 | 270184 |
| Oegol | city | Ulsan | Korea, Republic of (South) | 35.58 | 129.14 | 830 | 8493 |
| Oegosan | city | Ulsan | Korea, Republic of (South) | 35.43 | 129.28 | 226 | 56590 |
| Oesa | city | Ulsan | Korea, Republic of (South) | 35.59 | 129.27 | 200 | 194906 |
| Oeyang | city | Ulsan | Korea, Republic of (South) | 35.51 | 129.14 | 321 | 8493 |
| Ogol | city | Ulsan | Korea, Republic of (South) | 35.59 | 129.30 | 830 | 281009 |
| Ojeongdong | city | Ulsan | Korea, Republic of (South) | 35.60 | 129.30 | 344 | 240003 |
| Ok-dong | city | Ulsan | Korea, Republic of (South) | 35.50 | 129.29 | 32 | 271724 |
| Okdong | city | Ulsan | Korea, Republic of (South) | 35.61 | 129.14 | 337 | 8493 |
| Oksugok | city | Ulsan | Korea, Republic of (South) | 35.42 | 129.21 | 830 | 33905 |
| Ongok | city | Ulsan | Korea, Republic of (South) | 35.34 | 129.29 | 141 | 9714 |
| Osan | city | Ulsan | Korea, Republic of (South) | 35.44 | 129.30 | 42 | 101794 |