The three most populated counties of the world are

1. Tokyo, Japan - Tokyo is the most populated county in the world, with an estimated population of over 37 million people in 2021. It is a bustling metropolis and serves as the economic, political, and cultural center of Japan.

2. Delhi, India - Delhi is the second-most populated county in the world, with an estimated population of over 31 million people in 2021. It is the capital city of India and is known for its rich history, diverse culture, and rapid urbanization.

3. Shanghai, China - Shanghai is the third-most populated county in the world, with an estimated population of over 27 million people in 2021. It is a major global financial hub and the largest city in China. Shanghai is renowned for its modern skyline, vibrant economy, and rich cultural heritage.

As of 2021, the three most populated counties in the world are:

1. Tokyo Prefecture, Japan: Tokyo is the most populated prefecture in Japan and one of the most densely populated areas globally. It has a population of over 14 million people.

2. Delhi, India: Delhi, the capital territory of India, is the second most populated city in the world after Tokyo. With a population exceeding 30 million people, it is also one of the fastest-growing urban areas.

3. Shanghai, China: Shanghai is one of the most populous cities in the world and a global financial hub. It has a population of over 26 million people. With rapid urbanization, Shanghai has experienced significant population growth in recent decades.