| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Ōka | city | Saga-ken | Japan | 33.5016667 | 129.9558333 | 0 | 19757 |
| Ōka | city | Mie-ken | Japan | 34.1 | 136.2166667 | 656 | 31546 |
| Ōka | city | Mie-ken | Japan | 34.5 | 136.55 | 318 | 39068 |
| Ōkaba | city | Shizuoka-ken | Japan | 34.7166667 | 137.7666667 | 55 | 56130 |
| Ōkabachō | city | Shizuoka-ken | Japan | 34.7166667 | 137.7666667 | 55 | 56130 |
| Ōkachi | city | Kagoshima-ken | Japan | 28.3833333 | 129.5833333 | 164 | 37068 |
| Ōkaizaki | city | Miyagi-ken | Japan | 38.7 | 141.2333333 | 131 | 37439 |
| Ōkamitsugi | city | Miyagi-ken | Japan | 38.65 | 141.1333333 | 88 | 37462 |
| Ōkaneku | city | Okinawa-ken | Japan | 26.7 | 128.1166667 | 311 | 19134 |
| Ōkasho | city | Mie-ken | Japan | 34.35 | 136.4166667 | 820 | 39128 |
| Ōkawa | city | Kagoshima-ken | Japan | 31.95 | 130.2166667 | 68 | 18955 |
| Ōkawa | city | Saga-ken | Japan | 33.2 | 130.35 | 3 | 67913 |
| Ōkawa | city | Kagoshima-ken | Japan | 30.4166667 | 130.8666667 | 193 | 9860 |
| Ōkawa | city | Shizuoka-ken | Japan | 34.8333333 | 139.0666667 | 328 | 35621 |
| Ōkawa | city | Fukushima-ken | Japan | 37.4 | 139.4666667 | 1312 | 18624 |
| Ōkawa | city | Hokkaido | Japan | 41.6833333 | 140.35 | 328 | 8141 |
| Ōkawa | city | Hokkaido | Japan | 43.1833333 | 140.8 | 16 | 5106 |
| Ōkawa | city | Hokkaido | Japan | 42.7333333 | 143.4 | 206 | 8006 |
| Ōkawachi | city | Miyazaki-ken | Japan | 32.3666667 | 131.15 | 2952 | 20142 |
| Ōkawachō | city | Kanagawa-ken | Japan | 35.4833333 | 139.7166667 | 3 | 173637 |
| Ōkawaguchi | city | Miyagi-ken | Japan | 38.735 | 140.8925 | 380 | 37419 |
| Ōkawamachi | city | Kanagawa-ken | Japan | 35.4833333 | 139.7166667 | 3 | 173637 |
| Ōkawamachi | city | Akita-ken | Japan | 39.6833333 | 140.1 | 26 | 10011 |
| Ōkawamachi | city | Hokkaido | Japan | 43.1833333 | 140.8 | 16 | 5106 |
| Ōkawamochi | city | Tokushima-ken | Japan | 33.9666667 | 133.75 | 603 | 25783 |
| Ōkawano | city | Saga-ken | Japan | 33.3 | 129.9666667 | 101 | 42432 |
| Ōkawara | city | Oita-ken | Japan | 32.95 | 131.95 | 328 | 17116 |
| Ōkawara | city | Kanagawa-ken | Japan | 35.5402778 | 139.1202778 | 1312 | 261387 |
| Ōkawara | city | Miyagi-ken | Japan | 38.05 | 140.7336111 | 209 | 37765 |
| Ōki | city | Okinawa-ken | Japan | 26.2333333 | 127.7833333 | 3 | 31580 |
| Ōki | city | Hokkaido | Japan | 42.4905556 | 143.2747222 | 223 | 8040 |
| Ōkimi | city | Hiroshima-ken | Japan | 34.1666667 | 132.4833333 | 3 | 23940 |
| Ōkitayama-Kinugasayama | city | Kyoto-fu | Japan | 35.0333333 | 135.7333333 | 301 | 69825 |
| Ōkobori | city | Okinawa-ken | Japan | 26.65 | 127.8833333 | 285 | 25296 |
| Ōkomi | city | Kochi-ken | Japan | 33.3666667 | 133.0166667 | 1587 | 14245 |
| Ōku | city | Shimane-ken | Japan | 36.25 | 133.3666667 | 68 | 8424 |
| Ōkubo | city | Miyazaki-ken | Japan | 31.85 | 131.3666667 | 278 | 19212 |
| Ōkubo | city | Hyogo-ken | Japan | 34.6833333 | 134.95 | 101 | 54612 |
| Ōkubo | city | Niigata-ken | Japan | 36.9166667 | 137.9166667 | 2480 | 22609 |
| Ōkubo | city | Niigata-ken | Japan | 36.9833333 | 137.9166667 | 1282 | 23590 |
| Ōkubo | city | Saitama-ken | Japan | 35.9852778 | 139.0255556 | 984 | 216430 |
| Ōkubo | city | Tokyo-to | Japan | 34.1166667 | 139.5166667 | 715 | 23465 |
| Ōkubo | city | Tokyo-to | Japan | 35.7 | 139.7 | 104 | 802746 |
| Ōkubo | city | Tokyo-to | Japan | 35.7 | 139.7166667 | 101 | 781610 |
| Ōkubo | city | Akita-ken | Japan | 39.8666667 | 140.05 | 59 | 11027 |
| Ōkubo | city | Chiba-ken | Japan | 35.6833333 | 140.05 | 65 | 130965 |
| Ōkubo | city | Yamagata-ken | Japan | 38.4666667 | 140.3333333 | 291 | 15846 |
| Ōkubo | city | Iwate-ken | Japan | 39.2666667 | 141.2666667 | 554 | 10792 |
| Ōkubochō | city | Fukuoka-ken | Japan | 33.8666667 | 130.85 | 291 | 116596 |
| Ōkubochō | city | Hyogo-ken | Japan | 34.6833333 | 134.95 | 101 | 54612 |
| Ōkubogumi | city | Kagoshima-ken | Japan | 31.9166667 | 130.3166667 | 334 | 28495 |
| Ōkubokumi | city | Kagoshima-ken | Japan | 31.9166667 | 130.3166667 | 334 | 28495 |
| Ōkubomachi | city | Hyogo-ken | Japan | 34.6833333 | 134.95 | 101 | 54612 |
| Ōkubomachi | city | Akita-ken | Japan | 39.8666667 | 140.05 | 59 | 11027 |
| Ōkuchi | city | Kagoshima-ken | Japan | 32.0666667 | 130.6166667 | 652 | 28462 |
| Ōkuchi | city | Mie-ken | Japan | 34.5833333 | 136.55 | 45 | 35078 |
| Ōkuki | city | Ehime-ken | Japan | 33.5166667 | 132.6666667 | 328 | 34136 |
| Ōkuki | city | Aomori-ken | Japan | 40.4833333 | 141.6166667 | 167 | 13332 |
| Ōkuma | city | Kagoshima-ken | Japan | 28.4 | 129.5333333 | 574 | 34037 |
| Ōkuma | city | Fukuoka-ken | Japan | 33.5333333 | 130.75 | 318 | 124811 |
| Ōkuma | city | Wakayama-ken | Japan | 33.9833333 | 135.5666667 | 2188 | 29785 |
| Ōkuni | city | Mie-ken | Japan | 34.5166667 | 136.5666667 | 213 | 39050 |
| Ōkurayama | city | Saitama-ken | Japan | 35.9352778 | 139.1722222 | 1312 | 216543 |
| Ōkushi | city | Nagasaki-ken | Japan | 32.8666667 | 128.8883333 | 321 | 12455 |
| Ōkushi | city | Hiroshima-ken | Japan | 34.2333333 | 132.85 | 328 | 14236 |
| Ōkushigō | city | Nagasaki-ken | Japan | 32.8666667 | 128.8883333 | 321 | 12455 |
| Ōkuti | city | Kagoshima-ken | Japan | 32.0666667 | 130.6166667 | 652 | 28462 |
| Ōkuwa | city | Gumma-ken | Japan | 36.5 | 138.6 | 3162 | 37822 |
| Ōkuzo | city | Akita-ken | Japan | 40.1166667 | 140.6666667 | 984 | 12010 |
| Ōkuzo | city | Akita-ken | Japan | 40.1333333 | 140.6666667 | 984 | 12005 |
| Ōkuzu | city | Akita-ken | Japan | 40.1333333 | 140.6666667 | 984 | 12005 |
| Ōkō | city | Hiroshima-ken | Japan | 34.0833333 | 132.45 | 0 | 3546 |
| Ōkōchi | city | Miyazaki-ken | Japan | 32.3666667 | 131.15 | 2952 | 20142 |
| Ōkōra | city | Oita-ken | Japan | 32.95 | 131.95 | 328 | 17116 |
|
|