Roi Et's 2026 population is now estimated at 1,271,250. In 2005, the population of Roi Et was 1,299,453. Roi Et experienced a decrease of -4,637 residents over the past year, marking an annual decline of -0.36%. These population values and projections come from Thailand DOPA registered population by province (December snapshots) and World Population Review Internal Projections .
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| Bangkok | 5,186,582 | -0.98% |
| Nakhon Ratchasima | 2,599,753 | -0.24% |
| Ubon Ratchathani | 1,847,979 | -0.17% |
| Khon Kaen | 1,756,308 | -0.35% |
| Chiang Mai | 1,630,451 | -0.01% |
| Chon Buri | 1,619,225 | 0.74% |
| Buri Ram | 1,549,564 | -0.4% |
| Udon Thani | 1,524,495 | -0.5% |
| Nakhon Si Thammarat | 1,520,118 | -0.36% |
| Si Sa Ket | 1,429,315 | -0.42% |
| Songkhla | 1,415,421 | -0.1% |
| Samut Prakan | 1,363,410 | 0.4% |
| Surin | 1,339,850 | -0.58% |
| Nonthaburi | 1,326,991 | 0.79% |
| Roi Et | 1,271,250 | -0.36% |
| Pathum Thani | 1,242,738 | 1.06% |
| Chiang Rai | 1,156,893 | -0.22% |
| Sakon Nakhon | 1,133,052 | -0.24% |
| Chaiyaphum | 1,091,126 | -0.58% |
| Surat Thani | 1,070,934 | 0.14% |
