| Rank | City | Population | Notes |
|---|---|---|---|
| 1 | Phnom Penh | ~2.1 million | Capital, economic hub, Mekong/Tonlé Sap confluence. |
| 2 | Battambang | ~198,000 | Northwest, rice bowl, colonial architecture, bamboo train. |
| 3 | Siem Reap | ~189,000 | Gateway to Angkor Wat, tourism-driven. |
| 4 | Sihanoukville | ~147,000 | Deep-water port, beaches, casinos, Special Economic Zone. |
| 5 | Kandal | ~107,000 | Phnom Penh metro, garment factories, agriculture. |
Note: Urban definitions vary; Phnom Penh metro >3M. Rapid urbanization ongoing.