What is the most densely populated country in the world?

According to the World Bank, the most densely populated country in the world is Monaco. Monaco is a small, independent city-state on the French Riviera known for its luxurious casinos, yacht-lined harbor, and high-end boutiques. As of 2021, Monaco has an estimated population of around 39,000 people living in an area of just 0.78 square miles (2.02 square kilometers), resulting in a population density of approximately 49,200 people per square mile (19,000 people per square kilometer).

Other countries that are known for their high population densities include Singapore, Bahrain, and Vatican City. Singapore is a small island city-state with a population of over 5.7 million people and a population density of over 20,000 people per square mile (7,800 people per square kilometer). Bahrain is a small island nation in the Persian Gulf with a population density of over 6,700 people per square mile (2,600 people per square kilometer). Vatican City, the smallest country in the world, has a population density of approximately 5,900 people per square mile (2,300 people per square kilometer).