Ciudad Guayana's 2020 population is now estimated at 917,700. In 1950, the population of Ciudad Guayana was 4,990. Ciudad Guayana has grown by 88,568 since 2015, which represents a 2.05% 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 Ciudad Guayana, which typically includes Ciudad Guayana's population in addition to adjacent suburban areas.
| Year | Population | Growth Rate (%) | Growth |
|---|---|---|---|
| 2035 | 1,101,237 | 0.97% | 51,651 |
| 2030 | 1,049,586 | 1.15% | 58,198 |
| 2025 | 991,388 | 1.56% | 73,688 |
| 2020 | 917,700 | 2.05% | 88,568 |
| 2015 | 829,132 | 2.15% | 83,727 |
| 2010 | 745,405 | 2.15% | 75,273 |
| 2005 | 670,132 | 2.28% | 71,351 |
| 2000 | 598,781 | 2.63% | 72,800 |
| 1995 | 525,981 | 2.71% | 65,919 |
| 1990 | 460,062 | 4.08% | 83,319 |
| 1985 | 376,743 | 5.05% | 82,322 |
| 1980 | 294,421 | 7.89% | 92,991 |
| 1975 | 201,430 | 9.90% | 75,781 |
| 1970 | 125,649 | 15.60% | 64,772 |
| 1965 | 60,877 | 16.06% | 31,965 |
| 1960 | 28,912 | 19.21% | 16,903 |
| 1955 | 12,009 | 19.20% | 7,019 |
| 1950 | 4,990 | 0.00% |