UpAlphabetical listing of Places in Ibaraki
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Oarai-machi | city | Ibaraki | Japan | 36.32 | 140.58 | 3 | 80715 |
| Obari | city | Ibaraki | Japan | 35.98 | 140.05 | 65 | 76057 |
| Obata | city | Ibaraki | Japan | 36.22 | 140.17 | 85 | 15323 |
| Oda | city | Ibaraki | Japan | 36.15 | 140.12 | 52 | 47234 |
| Ogachi | city | Ibaraki | Japan | 36.47 | 140.28 | 830 | 8854 |
| Ogashiwa | city | Ibaraki | Japan | 35.94 | 139.97 | 65 | 238711 |
| Ogawa | city | Ibaraki | Japan | 36.17 | 140.35 | 19 | 32476 |
| Ogitsu | city | Ibaraki | Japan | 36.63 | 140.68 | 65 | 83642 |
| Oguri | city | Ibaraki | Japan | 36.37 | 140.02 | 157 | 34068 |
| Ohama | city | Ibaraki | Japan | 36.72 | 140.73 | 0 | 27211 |
| Ohata | city | Ibaraki | Japan | 36.78 | 140.58 | 1669 | 6169 |
| Ohata | city | Ibaraki | Japan | 36.78 | 140.62 | 1669 | 9568 |
| Okachi | city | Ibaraki | Japan | 36.47 | 140.28 | 830 | 8854 |
| Okachi | city | Ibaraki | Japan | 36.47 | 140.30 | 830 | 12765 |
| Okada | city | Ibaraki | Japan | 36.52 | 140.55 | 32 | 82165 |
| Okitsu | city | Ibaraki | Japan | 36.63 | 140.68 | 65 | 83642 |
| Okunoya | city | Ibaraki | Japan | 35.88 | 140.68 | 19 | 57587 |
| Okunoya | city | Ibaraki | Japan | 36.28 | 140.42 | 65 | 38911 |
| Okunoyahama | city | Ibaraki | Japan | 35.90 | 140.72 | 3 | 31969 |
| Omitama | city | Ibaraki | Japan | 36.25 | 140.38 | 72 | 11937 |
| Omitama-shi | city | Ibaraki | Japan | 36.25 | 140.38 | 72 | 11937 |
| Omiya | city | Ibaraki | Japan | 36.55 | 140.42 | 173 | 34863 |
| Onagawa | city | Ibaraki | Japan | 36.03 | 140.12 | 65 | 109686 |
| Ondeshi | city | Ibaraki | Japan | 35.96 | 140.00 | 32 | 124413 |
| Oniosa | city | Ibaraki | Japan | 35.98 | 140.00 | 29 | 90237 |
| Osaki | city | Ibaraki | Japan | 36.20 | 139.85 | 72 | 64059 |
| Ose | city | Ibaraki | Japan | 36.57 | 140.65 | 3 | 88307 |
| Osone | city | Ibaraki | Japan | 36.13 | 140.10 | 65 | 72704 |
| Ota | city | Ibaraki | Japan | 36.53 | 140.52 | 65 | 48692 |
| Otsu | city | Ibaraki | Japan | 36.83 | 140.78 | 3 | 26920 |
| Owada | city | Ibaraki | Japan | 36.09 | 140.32 | 65 | 14760 |
| Ozaki | city | Ibaraki | Japan | 36.20 | 139.85 | 72 | 64059 |
| Ozone | city | Ibaraki | Japan | 36.13 | 140.10 | 65 | 72704 |
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