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Area Codes 312 & 872
Telephone Central Office Building Pictures

The following are representative examples of telephone central office buildings in Area Code 312 and 872 (Inner City Chicago, Illinois).

Click on the pictures below for a larger version.


Chicago Zone 01

"Calumet"
 

Listing Updated:
July 2018

Operating Company:
at&t/SBC/Ameritech/Illinois Bell

CLLI:
CHCGILCADS0
CHCGILCADS1

Switch Type:
DS0: Alcatel/Lucent 5ESS
DS1: Genband/Nortel DMS-100

Prefixes Served:
DS0: (312) 326, 328, 528, 567, 570, 674, 791, 808, 945

DS1: (312) 225, 842, 949

Notes:
Source: GSV

 

 

Chicago Zone 01

"Canal"


 

Listing Updated:
July 2018

Operating Company:
at&t/SBC/Ameritech/Illinois Bell

CLLI:
CHCGILCLDS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(312) 258, 441, 463, 474, 627, 632, 715, 756, 876, 879, 887, 912, 928, 993

Notes:
Source: GSV

 

Chicago Zone 01

"Dearborn"
 

Listing Updated:
July 2018

Operating Company:
at&t/SBC/Ameritech/Illinois Bell

CLLI:
CHCGILCADS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(312) 222, 229, 245, 321, 396, 46, 527, 595, 742, 744, 755, 817, 822, 828, 832, 836, 840, 923, 970

Notes:
Source: GSV

 

Chicago Zone 01

"Franklin"
 

Listing Updated:
July 2018

Operating Company:
at&t/SBC/Ameritech/Illinois Bell

CLLI:
CHCGILCADS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(312) 201, 220, 230, 251, 267, 325, 357, 368, 443-4, 542, 553, 556-7, 592, 603, 606, 629-30, 641, 759, 797, 812, 849, 855, 857, 899, 984

Notes:
Source: GSV

 

 

Chicago Zone 01

"Lakeshore"


 

Listing Updated:
July 2018

Operating Company:
at&t/SBC/Ameritech/Illinois Bell

CLLI:
CHCGILCADS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(312) 228, 233, 240, 297, 374, 472, 540, 552, 565, 616, 653, 729, 819, 856, 861, 938, 946

Notes:
Also known as AON Center. Source: GSV

 

Chicago Zone 01

"Monroe"
 

Listing Updated:
July 2018

Operating Company:
at&t/SBC/Ameritech/Illinois Bell

CLLI:
CHCGILMODS0
CHCGILMODS1

Switch Type:
DS0: Alcatel/Lucent 5ESS
DS1: Genband/Nortel DMS-100

Prefixes Served:
DS0: (312) 421, 433, 491, 572, 633, 710, 738, 829, 850

DS1: (312) 226, 243, 355, 361, 413, 432, 455, 492, 563, 569, 666, 733, 743, 746, 864, 942, 996-7

Notes:
Source: GSV

 

Chicago Zone 01

"Superior"
 

Listing Updated:
July 2018

Operating Company:
at&t/SBC/Ameritech/Illinois Bell

CLLI:
CHCGILCADS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(312) 335, 417, 440, 534, 587, 654, 751, 790, 867, 932, 979

Notes:
Source: GSV

 

 

Chicago Zone 01

"Wabash"


 

Listing Updated:
July 2018

Operating Company:
at&t/SBC/Ameritech/Illinois Bell

CLLI:
CHCGILCADS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(312) 353, 362, 385, 408, 427, 435, 554, 582, 692, 697, 732, 789, 823, 886, 939, 983

Notes:
Source: GSV

 

 


Copyright 2018 Telephone Central Office Building Pictures
Page last modified July 9, 2018
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