United States vs South Africa: Population Comparison 2025
Post-segregation demographics. Different approaches to diversity and development.
United States
South Africa
Population Pyramids Comparison
Total Population
United States
347.3M
South Africa
64.7M
Youth (0-14)
United States
17.1%
South Africa
25.7%
Elderly (65+)
United States
18.4%
South Africa
6.9%
Demographic Analysis: United States vs South Africa
In 2025, United States has a population of 347M, while South Africa has 65M. This represents a difference of 283M, with United States having 5.4 times the population of the other. United States ranks #3 globally by population size, while South Africa ranks #24.
The median age reveals significant demographic differences: United States has a median age of 39.5 years, compared to 29.7 years in South Africa. This 9.8-year difference indicates that United States has a significantly older population, with important implications for workforce dynamics, healthcare needs, and economic development. The dependency ratio in United States is 55.0%, while in South Africa it is 48.4%, showing the relative burden of non-working age populations on the workforce.
Gender balance differs between the two countries: United States has a sex ratio of 100.99 males per female, while South Africa has 94.77. United States shows a higher proportion of males, which can affect marriage markets, labor force composition, and social dynamics. These ratios reflect various factors including sex-selective practices, differential mortality rates, and migration patterns.
Comprehensive Demographic Comparison 2025
| Indicator | United States | South Africa | Difference / Ratio |
|---|---|---|---|
| Population Metrics | |||
| Total Population (2025) | 347M | 65M | 5.4x larger |
| World Population Ranking | #3 | #24 | 21 places apart |
| Population Growth Rate (5-year) | +0.46% | +1.35% | 0.89pp difference |
| Projected Growth (2025-2050) | 0.00% | 0.00% | 0.00pp difference |
| Age Structure | |||
| Median Age | 39.5 years | 29.7 years | 9.8 years older |
| Youth (0-14) Population | 17.1% | 25.7% | 8.6pp difference |
| Working Age (15-64) Population | 64.5% | 67.4% | 2.9pp difference |
| Elderly (65+) Population | 18.4% | 6.9% | 11.5pp difference |
| Youth Bulge (15-29) | 19.7% | 24.8% | 5.1pp difference |
| Prime Workforce (25-54) | 39.1% | 43.7% | 4.5pp difference |
| Demographic Indicators | |||
| Total Dependency Ratio | 55.0% | 48.4% | 6.6pp difference |
| Child Dependency Ratio | 26.5% | 38.2% | 11.7pp difference |
| Old-Age Dependency Ratio | 28.5% | 10.2% | 18.3pp difference |
| Sex Ratio (males per 100 females) | 101.0 | 94.8 | 6.2 difference |
| Total Fertility Rate | 1.60 children/woman | 2.22 children/woman | 0.62 difference |
| Estimated Birth Rate | 10.7 per 1,000 | 18.2 per 1,000 | 7.5 difference |
| Aging Index (65+/0-14) | 107.5% | 26.8% | 80.8pp difference |
| Population Pyramid Type | constrictive | stationary | Different types |
📊 Understanding the Population Difference Chart
This visualization shows where and by how much the populations differ between United States and South Africa for each age group, split by gender:
Left Side (Males)
Blue = United States has more males
Green = South Africa has more males
Right Side (Females)
Pink = United States has more females
Orange = South Africa has more females
💡 How to Read: Each age group shows up to 2 bars - one on the left (male difference) and one on the right (female difference). The bar's color tells you which country has more people, and the bar's length shows by how much. For example, if you see a green bar on the left, it means South Africa has more males in that age group.
Notable Differences (>20% variance):
Population Difference
282.5M
United States larger
Growth Since 1950
United States
+125.2%
South Africa
+396.6%
Population Ratio
1 : 0.19
United States : South Africa
| Metric | United States | South Africa | Difference |
|---|---|---|---|
| Total Population | 347.3M | 64.7M | +436.4% |
| Median Age | 39.5 years | 29.7 years | +9.8 |
| Youth Population (0-14) | 59.4M 17.1% | 16.7M 25.7% | +256.5% |
| Working Age (15-64) | 224.0M 64.5% | 43.6M 67.4% | +413.5% |
| Elderly Population (65+) | 63.9M 18.4% | 4.5M 6.9% | +1332.4% |
| Total Dependency Ratio | 55.0 per 100 | 48.4 per 100 | +6.6 |
| Youth Dependency Ratio | 26.5 per 100 | 38.2 per 100 | -11.7 |
| Old-Age Dependency Ratio | 28.5 per 100 | 10.2 per 100 | +18.3 |
| Sex Ratio | 101.0 M/100F | 94.8 M/100F | +6.2 |
| Population Structure Type | Constrictive | Stationary | Different |
Total Population
United States
347.3M
South Africa
64.7M
Median Age
United States
39.5 years
South Africa
29.7 years
Youth Population (0-14)
United States
59.4M
17.1%
South Africa
16.7M
25.7%
Working Age (15-64)
United States
224.0M
64.5%
South Africa
43.6M
67.4%
Elderly Population (65+)
United States
63.9M
18.4%
South Africa
4.5M
6.9%
Total Dependency Ratio
United States
55.0 per 100
South Africa
48.4 per 100
Youth Dependency Ratio
United States
26.5 per 100
South Africa
38.2 per 100
Old-Age Dependency Ratio
United States
28.5 per 100
South Africa
10.2 per 100
Sex Ratio
United States
101.0 M/100F
South Africa
94.8 M/100F
Note: Dependency ratios represent the number of dependents (youth + elderly) per 100 working-age individuals. Higher ratios indicate greater economic burden on the working population.
Note: The replacement fertility rate of 2.1 is the level at which a population exactly replaces itself from one generation to the next.Both countries are experiencing demographic transitions as they develop economically. Countries below 2.1 face potential population decline without immigration, while those above 2.1 continue growing naturally.
Historic Milestone: 2023
South Africa became the world's most populous country, ending United States's centuries-long reign