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25. Caracas, Venezuela
> Population density: 51,289 people per square mile
> Population: 5.8 million
> Built-up land area in city: 114 square miles
Source: jankovoy / iStock via Getty Images
24. Kathmandu, Nepal
> Population density: 51,364 people per square mile
> Population: 4.0 million
> Built-up land area in city: 77 square miles
Source: Mayank Mani / iStock via Getty Images
23. Bareilly, India
> Population density: 52,594 people per square mile
> Population: 1.7 million
> Built-up land area in city: 32 square miles
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22. Surat, India
> Population density: 52,989 people per square mile
> Population: 4.9 million
> Built-up land area in city: 92 square miles
Source: tinnaporn / iStock via Getty Images
21. Gaya, India
> Population density: 53,692 people per square mile
> Population: 698,000
> Built-up land area in city: 13 square miles
