Diego Martin's 2026 population is now estimated at 99,305. In 2000, the population of Diego Martin was 105,720. Diego Martin experienced a decrease of -240 residents over the past year, marking an annual decline of -0.24%. These population values and projections come from Trinidad and Tobago municipal census 2000 via CityPopulation attribution, Trinidad and Tobago municipal census 2011 via CityPopulation attribution and World Population Review Internal Projections .
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| Tunapuna / Piarco | 231,303 | 0.48% |
| Couva / Tabaquite / Talparo | 202,172 | 0.84% |
| San Juan / Laventille | 157,208 | 0% |
| Princes Town | 118,527 | 0.98% |
| Chaguanas | 111,801 | 1.96% |
| Diego Martin | 99,305 | -0.24% |
| Penal / Debe | 97,928 | 0.61% |
| Siparia | 94,313 | 0.54% |
| Sangre Grande | 92,061 | 1.31% |
| Tobago | 71,527 | 1.08% |
| San Fernando | 41,105 | -1.14% |
| Mayaro / Rio Claro | 41,057 | 0.95% |
| Arima | 35,505 | 0.37% |
| Port of Spain | 25,324 | -2.51% |
| Point Fortin | 21,961 | 0.54% |