Port Harcourt's 2020 population is now estimated at 3,020,232. In 1950, the population of Port Harcourt was 59,752. Port Harcourt has grown by 676,377 since 2015, which represents a 5.20% 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 Port Harcourt, which typically includes Port Harcourt's population in addition to adjacent suburban areas.
| Year | Population | Growth Rate (%) | Growth |
|---|---|---|---|
| 2035 | 5,449,213 | 3.47% | 853,717 |
| 2030 | 4,595,496 | 3.91% | 801,721 |
| 2025 | 3,793,775 | 4.67% | 773,543 |
| 2020 | 3,020,232 | 5.20% | 676,377 |
| 2015 | 2,343,855 | 5.23% | 527,669 |
| 2010 | 1,816,186 | 5.23% | 408,876 |
| 2005 | 1,407,310 | 5.23% | 316,750 |
| 2000 | 1,090,560 | 5.24% | 245,576 |
| 1995 | 844,984 | 4.43% | 164,704 |
| 1990 | 680,280 | 2.41% | 76,324 |
| 1985 | 603,956 | 4.61% | 121,890 |
| 1980 | 482,066 | 6.11% | 123,721 |
| 1975 | 358,345 | 6.11% | 91,946 |
| 1970 | 266,399 | 6.11% | 68,354 |
| 1965 | 198,045 | 7.95% | 62,958 |
| 1960 | 135,087 | 8.88% | 46,802 |
| 1955 | 88,285 | 8.12% | 28,533 |
| 1950 | 59,752 | 0.00% |