World Population Day 2026: 10 most populous countries you should know about

Written By: Ayush Srivastava | Updated: Jul 10, 2026, 10:56 PM

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World Population Day 2026 highlights the changing global population landscape. Explore the 10 most populous countries in the world, their estimated population figures and the demographic trends shaping the future of humanity.

A look at the nations shaping global demographics — A look at the nations shaping global demographics

World Population Day 2026 is a reminder of how the world’s population continues to change with growing cities, younger generations and shifting demographics. As countries experience different population trends, some nations are seeing rapid growth while others are facing challenges due to ageing populations. In 2026, India remains the world’s most populous country, followed by China. This special photo gallery takes a look at the 10 most populous countries in the world and highlights their population figures, global importance and demographic patterns.

Why is World Population Day celebrated? — Why is World Population Day celebrated?

World Population Day is observed every year on July 11 to spread awareness about population-related issues, including family planning, healthcare, gender equality, reproductive rights and sustainable development. The day was established by the United Nations in 1989 after global attention grew around the world population reaching five billion in 1987. The theme for World Population Day 2026 focuses on “Realizing the hopes and aspirations of young people – today and for the future.” The occasion highlights the importance of empowering young people and creating opportunities for future generations.

India – The world’s most populous country — India – The world’s most populous country

India continues to hold the top position with an estimated population of around 1.47 billion people in 2026. The country contributes nearly 17.79% of the global population and has a relatively young population with a median age of around 29.2 years. India’s large workforce is considered an important factor for economic growth, while managing urbanisation and resources remains a major challenge.

China – A demographic giant facing change — China – A demographic giant facing change

China ranks second with an estimated population of around 1.41 billion people. Once the world’s most populated nation, China has experienced slower growth due to declining birth rates and an ageing population. With a median age of around 40.6 years, the country is focusing on policies to address demographic changes.

United States – The largest population in the Americas — United States – The largest population in the Americas

The United States has an estimated population of around 349 million in 2026. As the third most populous country globally, the US has a diverse population supported by immigration and urban growth. The country has a median age of approximately 38.7 years and continues to play a major role in global economics and technology.

Indonesia – Southeast Asia’s population powerhouse — Indonesia – Southeast Asia’s population powerhouse

Indonesia’s population is estimated at around 288 million, making it the fourth most populous country. The nation’s young population and growing economy have made it an important player in Southeast Asia. With a median age of nearly 30.7 years, Indonesia benefits from a strong working-age population.

Pakistan – A demographic force in South Asia — Pakistan – A demographic force in South Asia

Pakistan has an estimated population of around 259 million in 2026. The country has one of the youngest populations among the world’s largest nations. A growing youth population provides development opportunities but also increases the need for education, employment and healthcare facilities.

Nigeria – Africa’s rising population centre — Nigeria – Africa’s rising population centre

Nigeria’s population has reached around 242 million, making it Africa’s most populated country. Known for its extremely young population, Nigeria is expected to see continued growth in the coming decades. Experts believe its rising population could eventually bring it closer to the world’s top three most populated nations.

Brazil – South America’s biggest population — Brazil – South America’s biggest population

Brazil ranks seventh with an estimated population of around 213 million. The country remains the largest nation in South America by population. While Brazil has experienced slower growth compared to previous decades, it continues to hold major influence in the region.

Bangladesh – A densely populated nation — Bangladesh – A densely populated nation

Bangladesh has an estimated population of around 178 million people. Despite its limited land area, the country has managed significant progress in healthcare and economic development. Its young population continues to support growth across different sectors.

Russia – The largest country with an ageing population — Russia – The largest country with an ageing population

Russia has around 143 million people in 2026. Although it covers the largest land area in the world, the country faces demographic challenges due to declining birth rates and an ageing population. Its median age reflects the growing need to address population balance.

Ethiopia – Africa’s fast-growing population — Ethiopia – Africa’s fast-growing population

Ethiopia completes the list with an estimated population of around 139 million. The country represents Africa’s rapid demographic growth and has one of the youngest populations globally. Increasing investment in development and infrastructure remains important for supporting its expanding population.

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