Samut Prakan's 2025 population is now estimated at 1,393,410. In 1950, the population of Samut Prakan was 10,288. Samut Prakan has grown by 17,260 in the last year, which represents a 1.25% 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 Samut Prakan, which typically includes Samut Prakan's population in addition to adjacent suburban areas.
| City | 2025 Pop. ↓ | Growth |
|---|---|---|
| Bangkok | 11,391,700 | 1.41% |
| Chon Buri | 1,491,180 | 1.25% |
| Samut Prakan | 1,393,410 | 1.25% |
| Chiang Mai | 1,244,190 | 1.26% |
| Songkhla | 1,030,550 | 1.26% |
| Nonthaburi | 1,026,390 | 1.26% |
| 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 | 1.26% |
| Nakhon Pathom | 567,386 | 1.87% |
| Kalasin | 551,882 | 1.25% |
| Khon-Kaen | 535,847 | 1.26% |
| Surat Thani | 528,783 | 1.26% |
| Ubon Ratchathani | 527,549 | 1.24% |
| Lop Buri | 524,118 | 2.55% |
| Buri Ram | 483,767 | 1.25% |
| Lampang | 479,219 | 1.25% |
| Phra Nakhon Si Ayutthaya | 470,442 | 1.25% |
| Roi Et | 469,760 | 1.25% |
| Phuket | 460,810 | 1.25% |
| Ratchaburi | 438,953 | 1.42% |
| Sakon Nakhon | 406,297 | 1.26% |
| Chanthaburi | 406,188 | 1.87% |
| Suphan Buri | 380,383 | 1.86% |
| Lamphun | 338,166 | 1.26% |
