Colonia's 2026 population is now estimated at 137,993. In 1996, the population of Colonia was 123,583. Colonia has grown by 736 in the last year, which represents a 0.54% annual change. These population values and projections come from Uruguay department population 1996/2011/2023 (INE Censo 2023 Table 1) and World Population Review Internal Projections .
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| Montevideo | 1,285,414 | -0.45% |
| Canelones | 628,474 | 1.06% |
| Maldonado | 224,587 | 1.79% |
| Salto | 138,111 | 0.47% |
| Colonia | 137,993 | 0.54% |
| Paysandú | 123,079 | 0.34% |
| San José | 122,184 | 0.68% |
| Rivera | 110,006 | 0.21% |
| Tacuarembó | 96,720 | 0.24% |
| Cerro Largo | 91,481 | 0.17% |
| Soriano | 83,474 | -0.08% |
| Rocha | 82,611 | 0.78% |
| Artigas | 77,852 | 0.16% |
| Florida | 70,593 | 0.13% |
| Durazno | 62,783 | 0.41% |
| Lavalleja | 58,920 | -0.14% |
| Río Negro | 57,669 | 0.19% |
| Treinta y Tres | 47,006 | -0.49% |
| Flores | 26,212 | -0.08% |