UpAlphabetical listing of Places in Eritrea
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Oasi | city | Debubawi K'eyih Bahri | Eritrea | 13.27 | 42.05 | 1669 | 745 |
| Obellet | city | Debub | Eritrea | 16.26 | 39.19 | 42 | 2978 |
| Obellet | city | Debub | Eritrea | 16.14 | 38.94 | 830 | 3669 |
| Okkore | city | Semenawi K'eyih Bahri | Eritrea | 15.32 | 40.05 | 3 | 505 |
| Okoli Ela | city | Semenawi K'eyih Bahri | Eritrea | 15.32 | 40.07 | 26 | 326 |
| Olef | city | Gash Barka | Eritrea | 16.19 | 37.05 | 1820 | 596 |
| Om Ager | city | Gash Barka | Eritrea | 14.33 | 36.64 | 1952 | 14702 |
| Om Hager | city | Gash Barka | Eritrea | 14.33 | 36.64 | 1952 | 14702 |
| Om Hayer | city | Gash Barka | Eritrea | 14.33 | 36.64 | 1952 | 14702 |
| Omartu Barculli | city | Debubawi K'eyih Bahri | Eritrea | 13.95 | 41.08 | 3766 | 810 |
| Omhajer | city | Gash Barka | Eritrea | 14.33 | 36.64 | 1952 | 14702 |
| Ona | city | Semenawi K'eyih Bahri | Eritrea | 15.80 | 38.46 | 4383 | 51826 |
| Ona | city | Debubawi K'eyih Bahri | Eritrea | 14.56 | 40.96 | 830 | 894 |
| Ona Andom | city | Debub | Eritrea | 14.75 | 39.22 | 5869 | 4384 |
| Ona Foroho | city | Debub | Eritrea | 14.93 | 39.12 | 5869 | 1323 |
| Ona Forokho | city | Debub | Eritrea | 14.93 | 39.12 | 5869 | 1323 |
| Ona Gabien | city | Debub | Eritrea | 14.66 | 38.91 | 6085 | 7003 |
| Ona Yala | city | Debub | Eritrea | 14.80 | 38.84 | 6108 | 2569 |
| Ona Zerit | city | | Eritrea | 14.79 | 38.37 | 6010 | 7488 |
| Onabetta | city | Debub | Eritrea | 14.73 | 38.85 | 6709 | 6957 |
| Orguk | city | Debub | Eritrea | 15.11 | 38.75 | 6709 | 28515 |
| Orit Oddutay | city | Gash Barka | Eritrea | 15.30 | 38.64 | 6797 | 37250 |
| Orota | city | Semenawi K'eyih Bahri | Eritrea | 16.17 | 37.92 | 5869 | 5479 |
| Ortoresu Bota | city | Debubawi K'eyih Bahri | Eritrea | 12.65 | 42.64 | 1033 | 0 |
| Otumlo | city | Semenawi K'eyih Bahri | Eritrea | 15.63 | 39.42 | 65 | 9836 |
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