Listed in ascending order by area, they are: Kolkata district; the Kolkata Police area and the Kolkata Municipal Corporation area; or "Kolkata City; and the Kolkata metropolitan area, which is the city's urban agglomeration. 
 Can you tell me a little more about the demographics of Kolkata? 
 Hmm, interesting. Tell me more about the government. 
 Okay, now I need to know about the Demographics of Kolkata. 
 I have a trip to Kolkata coming up, and I want to know more information about Kolkata.
Listed in ascending order by area, they are: Kolkata district; the Kolkata Police area and the Kolkata Municipal Corporation area; or "Kolkata City; and the Kolkata metropolitan area, which is the city's urban agglomeration.