Belem's 2020 population is now estimated at 2,334,462. In 1950, the population of Belem was 242,091. Belem has grown by 154,314 since 2015, which represents a 1.38% 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 Belem, which typically includes Belem's population in addition to adjacent suburban areas.
| Year | Population | Growth Rate (%) | Growth |
|---|---|---|---|
| 2035 | 2,617,583 | 0.55% | 71,308 |
| 2030 | 2,546,275 | 0.74% | 92,477 |
| 2025 | 2,453,798 | 1.00% | 119,336 |
| 2020 | 2,334,462 | 1.38% | 154,314 |
| 2015 | 2,180,148 | 1.51% | 157,582 |
| 2010 | 2,022,566 | 1.59% | 153,336 |
| 2005 | 1,869,230 | 1.63% | 144,970 |
| 2000 | 1,724,260 | 3.91% | 300,700 |
| 1995 | 1,423,560 | 3.84% | 244,400 |
| 1990 | 1,179,160 | 3.62% | 192,070 |
| 1985 | 987,090 | 3.61% | 160,196 |
| 1980 | 826,894 | 3.22% | 121,057 |
| 1975 | 705,837 | 3.27% | 104,810 |
| 1970 | 601,027 | 4.74% | 124,305 |
| 1965 | 476,722 | 4.74% | 98,462 |
| 1960 | 378,260 | 4.56% | 75,658 |
| 1955 | 302,602 | 4.56% | 60,511 |
| 1950 | 242,091 | 0.00% |