Gotham City is not a real place, it is a work of fiction from the Batman comics created by Bob Kane. It is a version of New York City.
It's a mix between New York and Chiacgo.
New York
Gotham City
It is located in Melbourne Australia
Chicago is in Illinois. The city of Chicago is located in Illinois, and is the third most populous city in the the American Midwest. It is also knows as the "Windy City", and is the inspiration behind DC Comics' "Gotham".
Gotham City - New York City Metropolis - Chicago
Gotham City is intended to be a fictionalized version of New York City. Its a mix between New York and Chiacgo
Gotham City (its not a real city)!!!!
Gotham city.
The Batcave is located underneath Wayne Manor in Gotham City.
It is unknown what the Postcode for Gotham City is.
Confusingly enough there is no actual definite answer to where Gotham City is even located, various Writers have changed it's location over the years. A majority of the time it is normally considered to be in New York and legendary Batman writer Bill Finger said that it was the basis for Gotham. But DC had stated that Gotham is in New Jersey. In the recent Christopher Nolan films Gotham is actually more or less based on Chicago as he stated that was the basis for his interpretation of the city, but this is not considered canon but it can be considered the "Actual" location of Gotham. Alternatively in a episode of Young Justice Gotham was shown as being in Southwest Connecticut but this is also not canon, just more proof that no one truly knows where this city is located.
Gotham City Impostors happened in 2012.
The population of Gotham City is 30,000,000.