Houston is smaller than Chicago but bigger than Miami. It is the fourth largest city in the US.
The Houston City Statistical Area (CSA) covers 12,476 square miles, an area larger than Maryland (12,297 square miles).
The Houston Metropolitan Statistical Area (MSA) covers 10,062 square miles, an area smaller than Maryland but larger than Massachusetts (9,241 square miles).
At 639 square miles, the City of Houston could contain the cities of New York, Washington, Boston, San Francisco, Seattle, Minneapolis and Miami.
If the 10-county Houston MSA were a state, it would rank 20th in population—it has more than 5.2 million placing it behind Wisconsin and ahead of Minnesota and Colorado.
If the City of Houston were a state, it would rank 36th in population—its 2,016,582 residents in 2005 placing it behind Nevada (2,414,807) and ahead of New Mexico (1,928,384).
Checkout the largest 100 US cities from CityMayors.com.