On your demand I will get details and will also tell you ranks which come under Delhi Police, so that you can check it.

The Delhi Police was setup in 1861 which has 6 Ranges, 13 Police Districts, 62 Sub-Divisions with 184 Police Stations and 5 Specialised Crime Units declared as Police Stations.

Ranks
Commissioner of Police (CP)
Special Commissioner of Police (Special CP)
Joint Commissioner of Police (Joint CP)
Additional Commissioner of Police (Additional CP)
Deputy Commissioner of Police {Selection Grade} (DCP)
Deputy Commissioner of Police {Junior Administrative Grade} (DCP)
Additional Deputy Commissioner of Police (Additional DCP)
Assistant Commissioner of Police (Assistant CP or ACP)
Inspector
Sub Inspector
Assistant Sub Inspector
Head Constable
Constable

Responsibilities
Investigating crimes
Controlling criminal activities
Protection of women
Control traffic problem

Address:-
Delhi Police
MSO Building, Indraprashta Marg, IP Estate, New Delhi, Delhi 110095

Phone:-
011 2349 0010