Population data · Demographic research
Understand Population Change Across Countries and Regions
Demographer.org brings together country profiles, census updates, population trends and comparative analysis. Explore how fertility, aging, migration, urbanization and changing age structures shape populations over time.
Choose a Research Path
Start with a country, follow a major demographic trend, review a census programme or explore comparisons between populations.
Country Demographics
Population size, age structure, fertility, migration, urbanization, life expectancy and projections by country.
Open the country index → 02Demographic Trends
Regional and global changes involving population growth, decline, aging, youth populations and settlement patterns.
Explore demographic trends → 03Census and Population Data
Census schedules, enumeration methods, official population releases and explanations of how population counts are produced.
Review census updates → 04Demographic Analysis
Comparative research explaining why population patterns differ and what those differences mean over time.
Read demographic analysis →Featured Research
Selected research covering current census programmes, fertility change, population aging and the global distribution of young people.
India Census 2027
Timeline, digital self-enumeration, houselisting operations and the information expected to be collected.
Where the Global Youth Population Lives
The geographic distribution of people aged 15–24 and the regions where youth populations remain largest.
EU Population Change, Aging and Long-Term Decline
How aging, natural decrease and migration influence the European Union’s projected population path.
South Korea, Japan and Singapore Fertility
A comparison of recent fertility levels and the demographic settings behind ultra-low birth rates.
Explore the Questions Behind Population Change
Country figures become more useful when they are read through the processes that produce population growth, decline and structural change.
Where are populations still growing rapidly?
Compare countries where high fertility, young age structures and urban growth continue to expand the population.
Where are aging and low fertility reshaping society?
Review countries where smaller younger generations and longer lives are changing the balance between age groups.
How does migration affect population growth?
See how international migration influences population size, working-age groups and the pace of population aging.
Why can population figures differ by source?
Census counts, resident-population estimates, international mid-year estimates and projections measure different things.
Selected Country Profiles
Begin with countries representing different combinations of growth, decline, aging, migration and fertility change.
Read the Date, Definition and Source Together
A page edition may be labeled 2026 even when individual indicators come from different release years. Census counts, administrative estimates, survey results, international estimates and projection scenarios should not be treated as interchangeable values.
Find a Country Demographic Profile
Use the complete country index to locate published profiles and compare the demographic indicators available for each population.