Source: By Faris knight - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=15362941 / Wikimedia Commons
10. Tanta, Egypt
> Population density: 65,444 people per square mile
> Population: 589,000
> Built-up land area in city: 9 square miles
Source: Nikada / E+ via Getty Images
9. Hong Kong, Hong Kong
> Population density: 66,054 people per square mile
> Population: 7.4 million
> Built-up land area in city: 112 square miles
Source: monusco / Flickr
8. Mbuji-Mayi, Dem. Rep. of the Congo
> Population density: 70,132 people per square mile
> Population: 3.7 million
> Built-up land area in city: 53 square miles
Source: Devasahayam Chandra Dhas / iStock Unreleased via Getty Images
7. SAR Macau, China: Macau
> Population density: 70,600 people per square mile
> Population: 706,000
> Built-up land area in city: 10 square miles
Source: David Prasad / CC BY-SA 2.0
6. Firozabad, India
> Population density: 73,909 people per square mile
> Population: 813,000
> Built-up land area in city: 11 square miles
