Mitiaro's 2026 population is now estimated at 155. In 2021, the population of Mitiaro was 155. These population values and projections come from Cook Islands CISO Census 2021 Table 1.05 resident population by usual residence and World Population Review Internal Projections .
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| Aitutaki | 1,776 | 0% |
| Kiikii-Tupapa-Maraerenga | 1,749 | 0% |
| Nikao-Panama | 1,487 | 0% |
| Titikaveka | 1,276 | 0% |
| Ruaau-Arerenga | 1,199 | 0% |
| Matavera | 1,018 | 0% |
| Avatiu-Ruatonga-Atupa | 974 | 0% |
| Avarua | 974 | 0% |
| Ngatangiia | 795 | 0% |
| Murienua | 794 | 0% |
| Akaoa-Betela | 668 | 0% |
| Takuvaine | 629 | 0% |
| Mangaia | 471 | 0% |
| Pukapuka | 456 | 0% |
| Atiu | 382 | 0% |
| Tutakimoa-Teotue | 274 | 0% |
| Mauke | 249 | 0% |
| Penrhyn | 230 | 0% |
| Manihiki | 207 | 0% |
| Mitiaro | 155 | 0% |
| Nassau | 92 | 0% |
| Rakahanga | 81 | 0% |
| Palmerston | 25 | 0% |