| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Odzhakhkuli | city | (( Akhuryani Shrjan )) | Armenia | 40.7797222 | 43.8005556 | 4849 | 86271 |
| Odzun | city | K'aghak')) (( Alaverdi | Armenia | 41.0538889 | 44.6113889 | 3720 | 17725 |
| Oganavan | city | (( Aparani Shrjan )) | Armenia | 40.3422222 | 44.3863889 | 4379 | 19858 |
| Oghch'oghli | city | (( Akhuryani Shrjan )) | Armenia | 40.8094444 | 43.7527778 | 5203 | 40892 |
| Oghchʼoghli | city | (( Akhuryani Shrjan )) | Armenia | 40.8094444 | 43.7527778 | 5203 | 40892 |
| Ogrudzha | city | Geghark'unik'i Marz | Armenia | 40.2811111 | 45.7827778 | 7076 | 3384 |
| Ogurbeklu | city | K'aghak )) (( Ararat | Armenia | 39.9833333 | 44.5166667 | 2759 | 39675 |
| Okhchi | city | K'aghak' )) (( Goris | Armenia | 39.1963889 | 46.4633333 | 2273 | 6744 |
| Okhchogli | city | (( Akhuryani Shrjan )) | Armenia | 40.8094444 | 43.7527778 | 5203 | 40892 |
| Okhtar | city | K'aghak' )) (( Goris | Armenia | 39.2802778 | 46.3625 | 3533 | 9597 |
| Oksuz | city | (( Amasiayi Shrjan )) | Armenia | 41.1227778 | 43.6730556 | 7230 | 1861 |
| Oksyuz | city | (( Amasiayi Shrjan )) | Armenia | 41.1227778 | 43.6730556 | 7230 | 1861 |
| Oktember | city | Armaviri Marz | Armenia | 40.1361111 | 44.0138889 | 2834 | 71705 |
| Oktemberyan | city | Armaviri Marz | Armenia | 40.1522222 | 44.0308333 | 2857 | 71705 |
| Ollag | city | K'aghak )) (( Ararat | Armenia | 40.0780556 | 44.7494444 | 5636 | 16659 |
| Onut | city | K'aghak' )) (( Ijevan | Armenia | 40.9744444 | 45.2519444 | 2673 | 4096 |
| Oparts | city | K'aghak')) (( Alaverdi | Armenia | 40.9602778 | 44.4941667 | 4501 | 3451 |
| Opartsi | city | K'aghak')) (( Alaverdi | Armenia | 40.9602778 | 44.4941667 | 4501 | 3451 |
| Opartsy | city | K'aghak')) (( Alaverdi | Armenia | 40.9602778 | 44.4941667 | 4501 | 3451 |
| Orbatekh | city | K'aghak' )) (( Jermuk | Armenia | 39.8947222 | 45.3355556 | 5918 | 4215 |
| Ordaklu | city | Geghark'unik'i Marz | Armenia | 40.5202778 | 44.9308333 | 6282 | 30125 |
| Ordzhonikidze | city | Geghark'unik'i Marz | Armenia | 40.57 | 45.3955556 | 6604 | 3421 |
| Orgov | city | (( Aparani Shrjan )) | Armenia | 40.3333333 | 44.25 | 4557 | 9497 |
| Orom | city | (( Amasiayi Shrjan )) | Armenia | 40.6541667 | 43.8822222 | 5288 | 14256 |
| Ort'achya | city | (( Aparani Shrjan )) | Armenia | 40.6938889 | 44.3566667 | 7769 | 4135 |
| Ortachia | city | (( Aparani Shrjan )) | Armenia | 40.6938889 | 44.3566667 | 7769 | 4135 |
| Ortakend | city | K'aghak' )) (( Jermuk | Armenia | 39.7783333 | 45.3477778 | 4442 | 4186 |
| Ortakilisa | city | (( Amasiayi Shrjan )) | Armenia | 40.8530556 | 43.8294444 | 5364 | 45849 |
| Ortʼachya | city | (( Aparani Shrjan )) | Armenia | 40.6938889 | 44.3566667 | 7769 | 4135 |
| Oshakan | city | (( Aparani Shrjan )) | Armenia | 40.2705556 | 44.2691667 | 3290 | 14956 |
| Ovandara | city | K'aghak')) (( Alaverdi | Armenia | 41.0316667 | 44.5269444 | 5370 | 3732 |
| Ovit | city | (( Akhuryani Shrjan )) | Armenia | 40.7666667 | 44 | 5859 | 8228 |
| Ovit | city | (( Aparani Shrjan )) | Armenia | 40.6216667 | 44.2991667 | 6620 | 4574 |
| Ovnanadzor | city | K'aghak')) (( Alaverdi | Armenia | 41.0316667 | 44.5269444 | 5370 | 3732 |
| Ovtamech | city | Armaviri Marz | Armenia | 40.1836111 | 44.2572222 | 2887 | 85445 |
| Ovtashat | city | K'aghak )) (( Ararat | Armenia | 40.1019444 | 44.3427778 | 2742 | 47287 |
| Ovtashen | city | (( Akhuryani Shrjan )) | Armenia | 40.6666667 | 43.9 | 5196 | 14074 |
| Ovtashen | city | K'aghak )) (( Ararat | Armenia | 40.0244444 | 44.45 | 2742 | 33465 |
| Ovuni | city | (( Akhuryani Shrjan )) | Armenia | 40.8666667 | 43.8 | 5561 | 45849 |
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