As you want here I am giving below Delhi Police DCP phone Directory along with key contact numbers:

Officer E-mail Tel. Off. Fax No.
Commissioner of Police cp.bsbassi@nic.in
23490201 23722052
Special CP/Admin splcp-admin-dl@nic.in
23490202 23490333
Special CP/Int. & Anti Riot Cell splcp-intandops-dl@nic.in
splcp-antiriotcell-dl@nic.in
23490203 23352239
Special CP/Security splcp-security-dl@nic.in
23490204 23490489
Special CP/Vigilance splcp-vigilance-dl@nic.in
23490205/4205 23490268
Spl. CP/Law & Order 23490207 23490346
Spl. CP/Crime splcp-crime-dl@nic.in
23490209 23490481
Spl. CP/Armed Police splcp-armed-dl@nic.in
23490211 23490431
Spl. CP/Operation, FRRO & IGIA splcp-operation-dl@nic.in
23490210 23490418
Spl. CP/Traffic splcp-traffic-dl@nic.in
23490212 23490403
Spl. CP/P&L & Rectt splcp-pl-dl@nic.in
23962361/6628 23939560
Spl. CP/Training 23490215/4215 23490307
Spl. CP/Spl. Cell jtcp-splcell-dl@nic.in
23490227 23358965
Joint CP/Central Range jtcp-ndr-dl@nic.in
23490206 23490476
Joint CP/Northern Range jtcp-nr-dl@nic.in
23490231 23490231
Joint CP/South East Range jtcp-sr-dl@nic.in
23490226 23490108
Joint CP/South West Range 23490208 23490400
Joint CP/P&I (DPRU)+MD/DPHC splcp-pandi-dl@nic.in
23490213 23490213
Joint CP/SPU-W&C.CAW Cell 26882691 26110313
Joint CP/Training. . 25315003 25315006
Joint CP/HQ jtcp-phq-dl@nic.in
23490219 23490219
Joint CP/GA 23490220 23490372
Joint CP/Traffic jtcpt-dtp@nic.in
23490221 23490436
Joint CP/Crime jtcp-crime-dl@nic.in
23490223 23490349
Joint CP/Spl. Cell 23490231/4231
Joint CP/Sec. . 24106378-F/ PT-3835 23490418
Joint CP/Sec.(PM) . 24121584 24106378
Joint CP/R P Bhawan jcpsec@rb.nic.in
23015491 23015517
Joint CP/E.O.W. addlcp-eow-dl@nic.in
23746610 23361990
Joint CP/Vig. 23235473-74 23235473
Joint CP/Spl. Branch 23219873,23239515 23219873
Addl. CP/Traffic addlcpt-dtp@nic.in
26196102 26171603 Ext.7235
Addl. CP/SPU-W&C (CAW) addlcp-caw-dl@nic.in
26883769 24105214
Addl. CP/Sec. addlcp-security-dl@nic.in
26887218 26881152
Addl. CP/Principal PTC 25315137, 25315010 25315137
Addl. CP/Vig. & RTI 23210011, 23220130/5002 23234121
Addl. CP/Armed 27415566, 27436655 27436655
Addl. CP/Licensing addlcp-lic-dl@nic.in
26261525 26262260
Addl. CP/New Delhi 23747777 23347184
Addl. CP/West 25453992 25166509, 25926101/4222
Addl. CP/South East 26825544 26825822
Addl. CP/South-West dcp-southwest-dl@nic.in
28042984 28042990
DCP/Crime dcp-crime-dl@nic.in
23490252 23490340
DCP/EOW dcp-eow-dl@nic.in
26510008 26534230
DCP/Special Cell dcp-splcell-dl@nic.in
23490255 23490255
DCP/East dcp-east-dl@nic.in
22308568 22305577
DCP/North-East dcp-northeast-dl@nic.in
22825655 22826937
DCP/Central dcp-central-dl@nic.in
23261377 23261330
DCP/North dcp-north-dl@nic.in
23817012 23811770
DCP/North-West dcp-northwest-dl@nic.in
27229835 27462222
DCP/South dcp-south-dl@nic.in
26857726 26858366
DCP/Outer dcp-outer-dl@nic.in
27034873, 27034874 27034877, 27034873
DCP/New Delhi dcp-newdelhi-dl@nic.in
23747777 23347184
DCP/West dcp-west-dl@nic.in
25453992 25458369
DCP/PCR dcp-pcr-dl@nic.in
28744302 28744312
DCP/South-East dcp-southeast-dl@nic.in
26825822 26825544
DCP/Vigilance dcp-vigilance-dl@nic.in
23210011 Ext.5002,5061 23234121
DCP/IGI Airport dcp-igiairport-dl@nic.in
25671509 25675373

Delhi Police DCP phone Directory