1 mile line of people

In a one mile line, you can fit approximately 5,280 people, since each person would take up approximately a foot each.

Millions of people

If you follow sports, some stadiums can hold a lot of people. If you use 40,000 as an example, you would need 200 full stadiums of 40,000 people to hold a population of 8 million people living in a city.