@La_chica_gomela
Not so.
Berlin:
Population (2008–12-31)
– City 3,431,700
– Density 3,848/km2 (9,966.2/sq mi)
– Urban 3,700,000
– Metro 5,000,000
Houston
Population (2007)[1][2]
– City 2,242,193
– Density 3,828/sq mi (1,471/km2)
– Urban 3,822,509
– Metro 5,728,143
You are comparing the city stats of Berlin with the metro stats of Houston, which doesn’t work.