The most densely populated country in the world is Monaco, with more than 55,000 people per square mile.
Monaco is the second smallest country and monarchy in the world, and the majority of the population is made up of wealthy foreigners.
The country lies on the coast of the Mediterranean Sea, and has no natural resources.
Singapore, a city-state where 4 million people live on an island of 239 square miles (621 sq km), has a population density of 16,736 people per square mile.
Malta has 3,076 people per square mile.
Other crowded countries are Bahrain, Maldives, and Bangladesh.