Nigeria vs Tanzania
Nigeria has 3.4× the population of Tanzania: 237,527,782 vs 70,545,865, a gap of 167.0 million. Tanzania is growing faster (+2.86% vs +2.06% a year), adding about 2,014,190 people a year against +4,898,468. Using continuous exponential growth from the stated base year, if these rates held, Tanzania would overtake Nigeria in about 153 years (from the 2025 population bases, around 2178) — a projection, not a forecast. Nigeria is 3.3× as densely populated (250.2 vs 75.2 people per km²). People in Tanzania live 12.6 years longer on average (67.2 vs 54.6).
Country/territory population bases: World Bank 2025 (Nigeria) and 2025 (Tanzania); growth years 2025 / 2025. Annual source values, not live counts; years may differ. Growth is national, not local.
Nigeria vs Tanzania — side by side
 Nigeria |  Tanzania | |
|---|---|---|
| Population | 237,527,7822025 | 70,545,8652025 |
| Growth rate / yr | +2.06%2025 | +2.86%2025 |
| Births per 1,000 | 32.52024 | 34.82024 |
| Deaths per 1,000 | 11.62024 | 5.72024 |
| Children per woman | 4.382024 | 4.542024 |
| Life expectancy | 54.6 yrs2024 | 67.2 yrs2024 |
| Aged 0–14 | 40.5%2025 | 42.3%2025 |
| Aged 65+ | 3.1%2025 | 3.0%2025 |
| Density | 250.2 /km²2023 | 75.2 /km²2023 |
| Area | 923,770 km²2023 | 947,300 km²2023 |
| Urban population | 63.8%2025 | 36.9%2025 |
| Net migration / yr | -15,2582025 | -12,7302025 |
| GDP per capita | $1,2242025 | $1,3192025 |
| Country population rank (available records) | #6 | #21 |
| Base / world population (World Bank 2025) | 2.89% | 0.86% |
Highlighted cell = the higher value (not "better"). Small print under each value is its own data year. Source: World Bank; country/territory population bases may have different years. These are not live counts.
Population since 1960
World Bank population history (not the separate UN WPP timeline). Nigeria: 5.3× from 1960 to 2025; Tanzania: 7.1× from 1960 to 2025. Left: absolute population. Right: each series indexed to its own first available year = 100; baseline years may differ.
More comparisons
Region: Sub-Saharan Africa · rankings
Nigeria: Nigeria vs India, Nigeria vs China, Nigeria vs United States, Nigeria vs Indonesia, Nigeria vs Pakistan, Nigeria vs Brazil, Nigeria vs Bangladesh, Nigeria vs Russia.
Tanzania: Tanzania vs India, Tanzania vs China, Tanzania vs United States, Tanzania vs Indonesia, Tanzania vs Pakistan, Tanzania vs Nigeria, Tanzania vs Brazil, Tanzania vs Bangladesh.
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