United States vs United Kingdom: Population Comparison 2025
Compare USA and UK population pyramids. Demographic analysis of Anglo-American partners including aging populations, immigration impacts, and post-Brexit demographic shifts.
United States
United Kingdom
Population Pyramids Comparison
Total Population
United States
347.3M
United Kingdom
69.6M
Youth (0-14)
United States
17.1%
United Kingdom
17.0%
Elderly (65+)
United States
18.4%
United Kingdom
19.7%
Demographic Analysis: United States vs United Kingdom
In 2025, United States has a population of 347M, while United Kingdom has 70M. This represents a difference of 278M, with United States having 5.0 times the population of the other. United States ranks #3 globally by population size, while United Kingdom ranks #22.
The median age reveals significant demographic differences: United States has a median age of 39.5 years, compared to 41.1 years in United Kingdom. This 1.6-year difference indicates that United Kingdom 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 United Kingdom it is 57.9%, 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 United Kingdom has 97.06. 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 | United Kingdom | Difference / Ratio |
|---|---|---|---|
| Population Metrics | |||
| Total Population (2025) | 347M | 70M | 5.0x larger |
| World Population Ranking | #3 | #22 | 19 places apart |
| Population Growth Rate (5-year) | +0.46% | +0.64% | 0.19pp difference |
| Projected Growth (2025-2050) | 0.00% | 0.00% | 0.00pp difference |
| Age Structure | |||
| Median Age | 39.5 years | 41.1 years | 1.6 years younger |
| Youth (0-14) Population | 17.1% | 17.0% | 0.1pp difference |
| Working Age (15-64) Population | 64.5% | 63.3% | 1.2pp difference |
| Elderly (65+) Population | 18.4% | 19.7% | 1.3pp difference |
| Youth Bulge (15-29) | 19.7% | 18.2% | 1.5pp difference |
| Prime Workforce (25-54) | 39.1% | 38.8% | 0.3pp difference |
| Demographic Indicators | |||
| Total Dependency Ratio | 55.0% | 57.9% | 2.9pp difference |
| Child Dependency Ratio | 26.5% | 26.8% | 0.3pp difference |
| Old-Age Dependency Ratio | 28.5% | 31.1% | 2.6pp difference |
| Sex Ratio (males per 100 females) | 101.0 | 97.1 | 3.9 difference |
| Total Fertility Rate | 1.60 children/woman | 1.56 children/woman | 0.04 difference |
| Estimated Birth Rate | 10.7 per 1,000 | 10.2 per 1,000 | 0.5 difference |
| Aging Index (65+/0-14) | 107.5% | 116.1% | 8.6pp difference |
| Population Pyramid Type | constrictive | constrictive | Same type |
📊 Understanding the Population Difference Chart
This visualization shows where and by how much the populations differ between United States and United Kingdom for each age group, split by gender:
Left Side (Males)
Blue = United States has more males
Green = United Kingdom has more males
Right Side (Females)
Pink = United States has more females
Orange = United Kingdom 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 United Kingdom has more males in that age group.
Notable Differences (>20% variance):
Population Difference
277.7M
United States larger
Growth Since 1950
United States
+125.2%
United Kingdom
+38.8%
Population Ratio
1 : 0.20
United States : United Kingdom
| Metric | United States | United Kingdom | Difference |
|---|---|---|---|
| Total Population | 347.3M | 69.6M | +399.3% |
| Median Age | 39.5 years | 41.1 years | -1.6 |
| Youth Population (0-14) | 59.4M 17.1% | 11.8M 17.0% | +403.3% |
| Working Age (15-64) | 224.0M 64.5% | 44.0M 63.3% | +408.6% |
| Elderly Population (65+) | 63.9M 18.4% | 13.7M 19.7% | +366.0% |
| Total Dependency Ratio | 55.0 per 100 | 57.9 per 100 | -2.9 |
| Youth Dependency Ratio | 26.5 per 100 | 26.8 per 100 | -0.3 |
| Old-Age Dependency Ratio | 28.5 per 100 | 31.1 per 100 | -2.6 |
| Sex Ratio | 101.0 M/100F | 97.1 M/100F | +3.9 |
| Population Structure Type | Constrictive | Constrictive | Same |
Total Population
United States
347.3M
United Kingdom
69.6M
Median Age
United States
39.5 years
United Kingdom
41.1 years
Youth Population (0-14)
United States
59.4M
17.1%
United Kingdom
11.8M
17.0%
Working Age (15-64)
United States
224.0M
64.5%
United Kingdom
44.0M
63.3%
Elderly Population (65+)
United States
63.9M
18.4%
United Kingdom
13.7M
19.7%
Total Dependency Ratio
United States
55.0 per 100
United Kingdom
57.9 per 100
Youth Dependency Ratio
United States
26.5 per 100
United Kingdom
26.8 per 100
Old-Age Dependency Ratio
United States
28.5 per 100
United Kingdom
31.1 per 100
Sex Ratio
United States
101.0 M/100F
United Kingdom
97.1 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
United Kingdom became the world's most populous country, ending United States's centuries-long reign