Based on latest metropolitan/urban agglomeration estimates (2023–24):
| Rank | City | Country | Metro Population | Notes |
|---|---|---|---|---|
| 1 | Istanbul | Turkey | 16.0M | Transcontinental; only city on two continents |
| 2 | Tehran | Iran | 9.5M (city) / 16M (metro) | Capital, political/economic center |
| 3 | Baghdad | Iraq | 8.1M (metro) | Capital, historic Abbasid core |
| 4 | Riyadh | Saudi Arabia | 7.7M (metro) | Capital, Vision 2030 hub |
| 5 | Jeddah | Saudi Arabia | 4.7M (metro) | Red Sea gateway, Hajj portal |
| 6 | Ankara | Turkey | 5.7M (metro) | Capital, administrative center |
| 7 | Amman | Jordan | 4.5M (metro) | Capital, refugee hosting |
| 8 | Damascus | Syria | 2.5M (metro, est.) | Oldest continuously inhabited capital |
| 9 | Aleppo | Syria | 2.1M (metro, pre-war 4.6M) | Historic commercial heart, war-damaged |
| 10 | Kabul | Afghanistan | 4.6M (metro) | Capital, high growth despite conflict |
"Southwest Asia" = Middle East minus Egypt (North Africa) plus Turkey (transcontinental) and sometimes Caucasus. List above uses UN geoscheme: Western Asia = Turkey, Cyprus, Levant, Mesopotamia, Arabia, Iran, Caucasus.