Kolkata district (Bengali: কলকাতা জেলা) is an administrative district of the Indian state of West Bengal. It contains the centre part of the city of Kolkata. The jurisdiction of the Kolkata Collector, that is, of the district, is within the areas covered by the Kolkata Police and by the Kolkata Municipal Corporation, but it does not cover the entire area covered by either of them. See Civic administration of Kolkata.
As regards civic infrastructure (water, sewage, etc.), the area of Kolkata District is under the administration of the Kolkata Municipal Corporation. But other parts of the city's (that is, the KMC's) area, and of the city's suburban areas, belong to the districts of North 24 Parganas, South 24 Parganas, Howrah, Hooghly and Nadia.
Kolkata District is bordered by Howrah District, North 24 Parganas District and South 24 Parganas District.
The office of the Kolkata Collector is in B.B.D. Bag, north of the General Post Office.
As of 2011, following the order of Delimitation Commission in respect of the boundary delimitation of constituencies in the West Bengal, Kolkata district has 11 assembly constituencies:
None of the constituencies is reserved for Scheduled Castes (SC) candidates.
Prior to the delimitation, the district was divided into 17 assembly constituencies: