General Santos City's 2020 population is now estimated at 652,723. In 1950, the population of General Santos City was 32,269. General Santos City has grown by 59,234 since 2015, which represents a 1.92% 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 General Santos City, which typically includes General Santos City's population in addition to adjacent suburban areas.
| Year | Population | Growth Rate (%) | Growth |
|---|---|---|---|
| 2035 | 883,122 | 2.06% | 85,665 |
| 2030 | 797,457 | 2.06% | 77,339 |
| 2025 | 720,118 | 1.98% | 67,395 |
| 2020 | 652,723 | 1.92% | 59,234 |
| 2015 | 593,489 | 1.91% | 53,695 |
| 2010 | 539,794 | 2.68% | 66,957 |
| 2005 | 472,837 | 2.71% | 59,175 |
| 2000 | 413,662 | 4.98% | 89,292 |
| 1995 | 324,370 | 5.20% | 72,570 |
| 1990 | 251,800 | 5.27% | 57,010 |
| 1985 | 194,790 | 5.27% | 44,110 |
| 1980 | 150,680 | 5.27% | 34,137 |
| 1975 | 116,543 | 5.27% | 26,397 |
| 1970 | 90,146 | 5.27% | 20,419 |
| 1965 | 69,727 | 5.27% | 15,789 |
| 1960 | 53,938 | 5.27% | 12,220 |
| 1955 | 41,718 | 5.27% | 9,449 |
| 1950 | 32,269 | 0.00% |