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Area Codes 847 & 224
Telephone Central Office Building Pictures

The following are representative examples of telephone central office buildings in Area Codes 847 & 224 (Illinois).

Click on the pictures below for a larger version.


Algonquin
 

Listing Updated:
September 2020

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

CLLI:
ALGNILAQDS0

Switch Type:
Nokia/Siemens EWSD DE4 RCU

Prefixes Served:
(847) 458, 532, 658, 854

Notes:
Source: E. Stadick

 

Antioch
 

Listing Updated:
April 2021

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

CLLI:
ANTCILACDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(262) 396
(847) 395, 838

Notes:
Also serves North Antioch, WI. Source: GSV

 

Arlington Heights
 

Listing Updated:
May 2020

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

CLLI:
ARLHILAHDS1

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(224) 232, 625
(847) 222-3, 255, 259, 342, 368, 392, 394, 398, 506, 577, 590, 618, 632, 670, 788, 797, 818, 870

Notes:
Source: E. Stadick

 

Barrington

Photo 2
 

Listing Updated:
July 2020

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

CLLI:
BNTOILBADS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(847) 277, 304, 381-2, 842

Notes:
Source: E. Stadick

 

Barrington South
 

Listing Updated:
April 2021

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

CLLI:
BNTOILAGDS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(224) 512
(847) 248, 765, 898

Notes:
Source: GSV

 

Cary
 

Listing Updated:
May 2020

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

CLLI:
CARYILCADS0

Switch Type:
Nokia/Siemens EWSD DE5 RCU

Prefixes Served:
(847) 462, 516, 639

Notes:
Source: E. Stadick

 

Deerfield

Photo 2 | Photo 3 | Photo 4
 

Listing Updated:
May 2020

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

CLLI:
DRFDILDFDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(224) 632
(847) 236, 267, 282, 315, 317, 374, 405, 444, 527, 579, 831, 914, 940, 945, 948

Notes:
Source: JDD

 

Des Plaines

Listing Updated:
April 2020

Operating Company:
at&t/SBC/Ameritech/Sprint/Centel

CLLI:
DSPLILXLDS0
DSPLILXLDS1

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

Prefixes Served:
DS0: (224) 361 (773) 694, 741 (847) 294, 390, 635, 699, 768, 795

DS1: (773) 825 (847) 296-9, 375, 391, 493, 759, 803, 824, 827, 953

Notes:
Until 1997, Des Plaines was owned by an independent phone company (Centel, then later Sprint). In 1997 Sprint sold this CO to Ameritech. In a very rare case Western Electric had sold Centel a #5 Crossbar switch in order to be compatible with the switches in Chicago (then mostly Panel) since Step by Step and Panel can't communicate well. Picture source: GSV

 

Dundee

"East Dundee"

Photo 2
 

Listing Updated:
September 2020

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

CLLI:
EDNDILDUDS0

Switch Type:
Nokia/Siemens EWSD DE4 RCU

Prefixes Served:
(224) 293
(847) 426, 428, 551, 836, 844

Notes:
Source: E. Stadick

 

Elgin
 

Listing Updated:
September 2020

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

CLLI:
ELGNILELDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(224) 783
(630) 497
(847) 289, 429, 468, 488, 608, 695, 697, 741-2, 888, 931

Notes:
Source: E. Stadick

 

Elk Grove Village

Listing Updated:
May 2020

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

CLLI:
EGVGILEGDS0
EGVGILEGDS1

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

Prefixes Served:
DS0: (847) 238, 250, 262, 290, 350, 357, 427, 545, 595, 616, 734, 766, 773, 787, 806, 860

DS1: (773) 569 (847) 228, 354, 364, 437, 439, 472, 593, 640, 690, 700, 718, 758, 952, 956, 981

Notes:
Also serves the Bensenville ratecenter.
Source: E. Stadick

 

Evanston
 

Listing Updated:
April 2021

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

CLLI:
EVTNILEVDS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(224) 364
(773) 273
(847) 316, 328, 332, 424-5, 467, 475, 491-2, 570, 733, 864, 866, 869

Notes:
Source: GSV

 

Fox Lake
 

Listing Updated:
April 2021

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

CLLI:
FXLKILFKDS0

Switch Type:
Nokia/Siemens EWSD DE5 RCU

Prefixes Served:
(847) 497, 587, 973

Notes:
Source: GSV

 

Glenview
 

Listing Updated:
July 2020

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

CLLI:
GLVWILGVDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(224) 521
(847) 486, 646, 657, 724, 729, 832, 998

Notes:
Source: JDD

 

Grayslake
 

Listing Updated:
April 2021

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

CLLI:
GYLKILGLDS0

Switch Type:
Nokia/Siemens EWSD

Prefixes Served:
(224) 541
(847) 223, 543, 548, 665, 752

Notes:
Source: GSV

 

Hampshire
 

Listing Updated:
April 2021

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

CLLI:
HMPSILHSRS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(847) 683

Notes:
Source: GSV

 

Highland Park

Photo 2 | Photo 3
 

Listing Updated:
May 2020

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

CLLI:
HGPKILHPDS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(224) 765
(847) 266, 432-3, 681, 926

Notes:
Source: JDD

 

Huntley
 

Listing Updated:
April 2021

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

CLLI:
HNTLILHODS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(224) 569, 654
(847) 669, 802, 961

Notes:
Source: GSV

 

Lake Forest
 

Listing Updated:
April 2021

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

CLLI:
LKFRILLFDS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(224) 212, 544, 552
(847) 234, 283, 295, 482, 535, 582, 604, 615, 735

Notes:
Source: GSV

 

Lake Villa
 

Listing Updated:
April 2021

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

CLLI:
LKVLILLKDS0

Switch Type:
Nokia/Siemens EWSD

Prefixes Served:
(224) 444, 643
(847) 265, 356

Notes:
Source: GSV

 

Lake Zurich
 

Listing Updated:
December 2020

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

CLLI:
LKZRILLZDS0

Switch Type:
Nokia/Siemens EWSD RSU-DE4

Prefixes Served:
(847) 438, 540, 550, 726, 862

Notes:
Source: E. Stadick

 

Libertyville
 

Listing Updated:
April 2021

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

CLLI:
LBVLILLIDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(847) 247, 362, 367, 522, 549, 566

Notes:
Source: GSV

 

Morton Grove
 

Listing Updated:
May 2020

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

CLLI:
MRGVILMGDS0

Switch Type:
Nokia/Siemens EWSD

Prefixes Served:
(847) 470, 581, 583, 663, 965-7

Notes:
Source: Mark J.

 

North Chicago
 

Listing Updated:
April 2021

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

CLLI:
NCHCILNCDS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(224) 302, 399, 572, 665, 667-8, 772
(847) 473, 578, 689, 775, 785, 887, 935-8

Notes:
Also serves parts of Waukegan. Source: GSV

 

Northbrook

Photo 2 | Photo 3
 

Listing Updated:
May 2020

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

CLLI:
NBRKILNBDS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(847) 205, 272, 291, 412, 480, 498, 509, 559, 562, 564, 664, 714, 753, 849

Notes:
Source: JDD

 

Northbrook West
 

Listing Updated:
April 2021

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

CLLI:
NBRKILNTDS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(847) 326, 402, 513, 667

Notes:
Source: GSV

 

Palatine
 

Listing Updated:
July 2020

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

CLLI:
PALTILPADS0

Switch Type:
Nokia/Siemens EWSD Remote Switch Unit RSU-DE4

Prefixes Served:
(224) 836
(847) 202, 358, 359, 485, 705, 776, 934, 963, 991

Notes:
Source: E. Stadick

 

Park Ridge
 

Listing Updated:
April 2021

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

CLLI:
PRRGILXLDS0
PRRGILXLDS1

Switch Type:
DS0: Ribbon/Genband/Nortel DMS-100

DS1: Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
DS0: (773) 380, 399, 864, 867
(847) 318, 384, 698

DS1: (773) 444, 693, 695, 714
(847) 292, 518, 685, 692, 696, 723, 823, 825

Notes:
Also serves parts of Chicago Zone 3 (Newcastle). Source: GSV

 

Plato Center
 

Listing Updated:
April 2021

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

CLLI:
PLCTILPRRS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(847) 464

Notes:
Source: GSV

 

Poplar Creek

"Hoffman Estates"
 

Listing Updated:
January 2021

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

CLLI:
HFESILPCDS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(847) 286, 396, 645, 747

Notes:
Also serves the Dundee ratecenter. Source: E. Stadick

 

Round Lake
 

Listing Updated:
April 2021

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

CLLI:
RNLKILRLDS0

Switch Type:
Nokia/Siemens EWSD DE5 RCU

Prefixes Served:
(847) 270, 546, 740

Notes:
Source: GSV

 

Schaumburg

Photo 2
 

Listing Updated:
July 2020 / January 2021

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

CLLI:
SCBGILCODS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(224) 698
(847) 330, 407, 413, 517, 605, 619, 706, 762, 874, 944, 969, 995

Notes:
Photo 2 shows the building in the winter time without trees (January 2021). Source: E. Stadick

 

Schaumburg North

"Main"
 

Listing Updated:
July 2020

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

CLLI:
SCBGILRSDS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(847) 435, 523, 538, 576, 761, 907

Notes:
Source: E. Stadick

 

Schiller Park
 

Listing Updated:
April 2021

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

CLLI:
SCPKILSPDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(773) 992
(847) 671, 678, 928

Notes:
Source: GSV

 

Skokie
 

Listing Updated:
April 2021

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

CLLI:
SKOKILSKDS0

Switch Type:
Nokia/Siemens EWSD DE5 RCU

Prefixes Served:
(224) 251, 592
(847) 329, 568, 573-7, 679, 763, 933, 982

Notes:
Source: GSV

 

Wauconda
 

Listing Updated:
April 2021

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

CLLI:
WCNDILWUDS0

Switch Type:
Nokia/Siemens EWSD DE5 RCU

Prefixes Served:
(847) 487, 526

Notes:
Source: GSV

 

Waukegan

"Main"
 

Listing Updated:
April 2021

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

CLLI:
WKGNILWKDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(847) 244, 249, 263, 336, 360, 599, 623, 625, 662, 782

Notes:
Source: GSV

 

Waukegan

"Gurnee"
 

Listing Updated:
April 2021

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

CLLI:
GURNILAARS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(847) 855-6

Notes:
Source: GSV

 

Wheeling

"Main"

Photo 2
 

Listing Updated:
January 2021

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

CLLI:
WLNGILWGDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(224) 542
(847)  215, 229, 279, 419, 459, 465, 478, 520, 537, 541, 552, 554, 617, 634, 793, 808, 821, 883, 913, 955

Notes:
Source: E. Stadick

 

Wheeling

"Lincolnshire"
 

Listing Updated:
April 2021

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

CLLI:
LNSRILABRS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(847) 793, 883

Notes:
Source: GSV

 

Willowcrest

"Hoffman Estates"
 

Listing Updated:
April 2021

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

CLLI:
HFESILWLDS1

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(224) 653
(630) 872
(847) 252, 303, 310, 348, 397, 490, 519, 536, 755, 781, 839, 843, 880, 882, 884-5, 925

Notes:
Source: GSV

 

Wilmette
 

Listing Updated:
April 2021

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

CLLI:
WLMTILWIDS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(847) 251, 256, 853, 920

Notes:
Source: GSV

 

Winnetka

Photo 2 | Photo 3
 

Listing Updated:
June 2020

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

CLLI:
WNTKILWNDS0

Switch Type:
Nokia/Siemens EWSD

Prefixes Served:
(847) 242, 441, 446, 501, 784, 835

Notes:
Source: JDD

 

Zion
 

Listing Updated:
April 2021

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

CLLI:
ZIONILZNDS0

Switch Type:
Nokia/Siemens EWSD

Prefixes Served:
(847) 731, 746, 872

Notes:
Source: GSV

 

 


Copyright 2021 Telephone Central Office Building Pictures
Page last modified April 9, 2021
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