UpAlphabetical listing of Places in Tehran
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Ochunak | city | Tehran | Iran | 35.57 | 52.24 | 5935 | 2086 |
| Ondarīyeh | city | Tehran | Iran | 35.78 | 52.45 | 6912 | 2086 |
| Oojoonak | city | Tehran | Iran | 35.57 | 52.24 | 5935 | 2086 |
| Ordūlū | city | Tehran | Iran | 35.67 | 52.05 | 6709 | 2086 |
| Orin | city | Tehran | Iran | 35.55 | 51.13 | 3471 | 119667 |
| Ostad Mo`in | city | Tehran | Iran | 35.70 | 51.34 | 3766 | 1213020 |
| Ostad Mo`in-e Gharbi | city | Tehran | Iran | 35.70 | 51.34 | 3766 | 1213020 |
| Ostad Moein | city | Tehran | Iran | 35.70 | 51.34 | 3766 | 1213020 |
| Ostad-e Mo`in Sharqi | city | Tehran | Iran | 35.69 | 51.35 | 4189 | 1294455 |
| Ostād Mo‘īn | city | Tehran | Iran | 35.70 | 51.34 | 3766 | 1213020 |
| Ostād Mo‘īn-e Gharbī | city | Tehran | Iran | 35.70 | 51.34 | 3766 | 1213020 |
| Ostād-e Mo‘īn Sharqī | city | Tehran | Iran | 35.69 | 51.35 | 4189 | 1294455 |
| Ostūr | city | Tehran | Iran | 35.69 | 50.88 | 4189 | 104684 |
| Ouchonak | city | Tehran | Iran | 35.57 | 52.24 | 5935 | 2086 |
| Ovreh | city | Tehran | Iran | 35.74 | 52.07 | 6709 | 2476 |
| Ovrīn | city | Tehran | Iran | 35.55 | 51.13 | 3471 | 119667 |
| Owchunak | city | Tehran | Iran | 35.57 | 52.24 | 5935 | 2086 |
| Owlia' | city | Tehran | Iran | 35.19 | 51.75 | 2696 | 28462 |
| Owlīā’ | city | Tehran | Iran | 35.19 | 51.75 | 2696 | 28462 |
| Owqaf | city | Tehran | Iran | 35.75 | 51.51 | 4491 | 730242 |
| Owshan | city | Tehran | Iran | 35.90 | 51.52 | 6003 | 1962 |
| Owsūn | city | Tehran | Iran | 35.85 | 51.42 | 6758 | 7582 |
| Owzaneh | city | Tehran | Iran | 35.78 | 51.99 | 7824 | 5457 |
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