Use one definition
Population totals use 1 July values. Age shares use consistent 0–14, 15–64, and 65+ boundaries. Close ranks can otherwise reflect incompatible definitions.
Comparable country data
World population rankings by country in 2026
Twelve ways to compare 237 countries and areas using one consistent UN dataset. Every row links to the age structure behind the rank.
Population size and change
Compare current scale with the direction and size of projected change.
Age structure
Separate median age from the actual shares of children and older adults.
Fertility and longevity
Explore two forces that reshape the base and top of a population pyramid.
Choose the right measure
Population rankings answer different questions
A country can be large without growing quickly, young without having the highest current fertility rate, or old without having the smallest share of children. These tables keep those concepts separate so that a high position in one ranking is not mistaken for a general description of the population.
Start with total population when scale matters. Use annual growth to compare the present direction of change, and the projected increase or decline to compare the absolute number of people added or lost by 2050. Percentage growth and numerical change are not interchangeable: a small country can grow rapidly while adding fewer people than a large country growing slowly.
For age structure, median age identifies the midpoint of the population, while the under-15 and 65+ shares show how much of the population occupies broad life stages. The age dependency ratio combines children and older adults relative to the working-age population, but it is a demographic measure—not a count of people who are economically dependent.
Why the rankings link to full profiles
Every rank compresses a complex age structure into one value. Open a country profile to see whether the result is driven by broad trends or particular cohorts, compare 1950 with 2026, and inspect the UN medium projection for 2050 and 2100. This makes the ranking useful for exploration without stripping away the context needed to interpret it.
Read rankings responsibly
A rank is the beginning of the explanation
Separate estimates from projections
The 2026 values are medium-scenario projections. They are useful for comparison, but not observed head counts or outcomes guaranteed to occur.
Open the age structure
Median age, fertility, and growth summarize different processes. The linked population pyramid shows the cohorts and asymmetries that a single number conceals.
Calculation rules, source files, short-name handling, and limitations are documented in the data methodology.