Earth is home to more than 7.4 billion people. This is expected to increase in the coming decades to more than 9.7 billion. Some countries have initiatives to help control the population, but others are encouraging large families. There are 193 countries that are United Nations members, two that are officially recognized UN observers, and two unrecognized nations, in the world that people call home. Some of these, such as Vatican City, aren’t highly populated. Other countries are highly populated.
Mexico comes in last on the list with an estimated 127 million residents. Federal District, Mexico City, is the most populated area with a population of around 21.2 million people, but only around 12.2 million of those live within the city limits. Itzapalpa is the second most populous city with 1.82 million residents, and Ecatepec is third with 1.8 million residents.
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