Suphan Buri's 2025 population is now estimated at 380,383. In 1950, the population of Suphan Buri was 10,313. Suphan Buri has grown by 6,953 in the last year, which represents a 1.86% annual change.These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Suphan Buri, which typically includes Suphan Buri's population in addition to adjacent suburban areas.
| City | 2025 Pop. ↓ | Growth |
|---|---|---|
| Bangkok | 11,391,700 | 1.4% |
| Chon Buri | 1,491,180 | 1.25% |
| Samut Prakan | 1,393,410 | 1.25% |
| Chiang Mai | 1,244,190 | 1.25% |
| Songkhla | 1,030,550 | 1.25% |
| Nonthaburi | 1,026,390 | 1.25% |
| Pathum Thani | 974,195 | 1.25% |
| Nakhon Ratchasima | 821,187 | 1.2% |
| Samut Sakhon | 616,533 | 1.25% |
| Udon Thani | 604,163 | 1.19% |
| Chiang Rai | 586,352 | 1.25% |
| Rayong | 573,756 | 1.25% |
| Nakhon Pathom | 567,386 | 1.87% |
| Kalasin | 551,882 | 1.25% |
| Khon-Kaen | 535,847 | 1.25% |
| Surat Thani | 528,783 | 1.25% |
| Ubon Ratchathani | 527,549 | 1.24% |
| Lop Buri | 524,118 | 2.55% |
| Buri Ram | 483,767 | 1.25% |
| Lampang | 479,219 | 1.25% |
