Nnewi's 2020 population is now estimated at 1,050,860. In 1950, the population of Nnewi was 3,181. Nnewi has grown by 280,792 since 2015, which represents a 6.42% 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 Nnewi, which typically includes Nnewi's population in addition to adjacent suburban areas.
| Year | Population | Growth Rate (%) | Growth |
|---|---|---|---|
| 2035 | 1,967,116 | 3.47% | 308,532 |
| 2030 | 1,658,584 | 4.02% | 296,741 |
| 2025 | 1,361,843 | 5.32% | 310,983 |
| 2020 | 1,050,860 | 6.42% | 280,792 |
| 2015 | 770,068 | 6.49% | 207,665 |
| 2010 | 562,403 | 6.49% | 151,664 |
| 2005 | 410,739 | 6.49% | 110,739 |
| 2000 | 300,000 | 6.49% | 80,920 |
| 1995 | 219,080 | 6.49% | 59,080 |
| 1990 | 160,000 | 10.31% | 62,027 |
| 1985 | 97,973 | 10.30% | 37,973 |
| 1980 | 60,000 | 10.06% | 22,854 |
| 1975 | 37,146 | 10.06% | 14,146 |
| 1970 | 23,000 | 10.40% | 8,974 |
| 1965 | 14,026 | 10.39% | 5,471 |
| 1960 | 8,555 | 10.40% | 3,339 |
| 1955 | 5,216 | 10.40% | 2,035 |
| 1950 | 3,181 | 0.00% |