Chicago (/ ʃ ɪ ˈ k ɑː ɡ oʊ, - ˈ k ɔː-/ ( listen)), officially the City of Chicago, is the third most populous city in the United States, after New York City and Los Angeles. With over 2.7 million residents, it is also the most populous city in both the state of Illinois and the Midwestern United States.
Houston , Texas 's estimated population is 2,303,482. according to the most recent United States census. Houston is the 4th largest city in the United States and the largest in Texas. The city also has a global economy and only New York City has more Fortune 500 headquarters.
Houston Population 2018 Texas, Population of Houston as per US Census 2010 is 2,099,451 (2+ Million): Houston Population 2018: Houston is the most populous city of the State of Texas. Houston is situated in the south-east of Texas, near the Gulf of Mexico.
Philadelphia is Pennsylvania's largest city, the second-largest city on the US's East Coast and the 5th most populous city in the US. It also has the designation of the only consolidated city-county in the state with a population that was 1,526,006 according to the last official census in 2010.
San Diego has a population density of 4,003 people per square mile in the city proper. The metropolitan population is much larger, however, and is estimated at 3.1 million people. This is the third-largest metro area after Los Angeles and San Francisco.