Final answer:
The population of Mexico City is about 18 million with unofficial estimates reaching 30 million. The city is growing at a rate of over 1,000 people per day.
Step-by-step explanation:
Mexico City is one of the largest cities in the world and in 2010, the official population was about 18 million. However, unofficial population estimates can reach 30 million. The city is growing at a rate of more than 1,000 people per day through a combination of births and migration.