The Reserve Bank of India has updated its Branch Locator - a link on its website containing the list of branches/offices of commercial banks. The link now has classification of branches/offices into various population groups with revised base population as per Census 2011. As mentioned in the RBI circular (RBI/2016-17/60/DBR.No.BAPD.BC.12/22.01.001/2016-17 dated September 1, 2016), the effective date for population group classification of centres as per Census 2011 is September 1, 2016.
Branch Locator - link
The Reserve Bank compiles these data on the basis of the information furnished by the banks in terms of its master circular on branch authorisation.
Source: RBI Press Release : 2016-2017/1081 dated 1st November 2016