Bethune's 2020 population is now estimated at 358,084. In 1950, the population of Bethune was 126,316. Bethune has grown by 2,342 since 2015, which represents a 0.13% 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 Bethune, which typically includes Bethune's population in addition to adjacent suburban areas.
| Year | Population | Growth Rate (%) | Growth |
|---|---|---|---|
| 2035 | 387,239 | 0.60% | 11,361 |
| 2030 | 375,878 | 0.59% | 10,980 |
| 2025 | 364,898 | 0.38% | 6,814 |
| 2020 | 358,084 | 0.13% | 2,342 |
| 2015 | 355,742 | 0.11% | 2,002 |
| 2010 | 353,740 | 0.16% | 2,755 |
| 2005 | 350,985 | 0.19% | 3,233 |
| 2000 | 347,752 | -0.00% | -51 |
| 1995 | 347,803 | -0.07% | -1,232 |
| 1990 | 349,035 | 0.27% | 4,631 |
| 1985 | 344,404 | 4.36% | 66,167 |
| 1980 | 278,237 | 12.91% | 126,618 |
| 1975 | 151,619 | 0.92% | 6,782 |
| 1970 | 144,837 | 0.15% | 1,079 |
| 1965 | 143,758 | 0.55% | 3,869 |
| 1960 | 139,889 | 1.16% | 7,827 |
| 1955 | 132,062 | 0.89% | 5,746 |
| 1950 | 126,316 | 0.00% |