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Area Code 815
Telephone Central Office
Building Pictures
The following are representative examples of telephone central office buildings in Area Codes 815 and 779 (Illinois).
Click on the pictures below for a larger version.
Crystal Lake
Listing Updated:
May 2020Operating Company:
at&t/SBC/Ameritech/Illinois BellCLLI:
CRLKILCKDS0Switch Type:
Ribbon/Genband/Nortel DMS-100Prefixes Served:
(815) 356, 444, 455, 459, 477, 479, 788Notes:
Source: E. Stadick
Galena
Listing Updated:
November 2011Operating Company:
at&t/SBC/Ameritech/Illinois BellCLLI:
GALNILGADS1Switch Type:
Nokia/Siemens EWSDPrefixes Served:
(815) 776-7Notes:
Source: TCO
Joliet
Listing Updated:
August 2020Operating Company:
at&t/SBC/Ameritech/Illinois BellCLLI:
JOLTILJODS1Switch Type:
Nokia/Siemens EWSD DE5 RSUPrefixes Served:
(779) 435
(815) 423, 424, 722, 723, 724, 726, 727, 740, 768, 774Notes:
Source: E. Stadick
Joliet West
Listing Updated:
August 2020Operating Company:
at&t/SBC/Ameritech/Illinois BellCLLI:
JOLTILJWDS0Switch Type:
Ribbon/Genband/Nortel DMS-100Prefixes Served:
(815) 725, 729, 730, 741, 744, 773Notes:
Source: E. Stadick
La Salle
Listing Updated:
October 2008Operating Company:
at&t/SBC/Ameritech/Illinois BellCLLI:
LSLLILLSDS0Switch Type:
Nokia/Alcatel/Lucent 5ESS HostPrefixes Served:
(815) 220, 223-4Notes:
Host switch for nearby Oglesby and Utica.
Manhattan
Listing Updated:
August 2020Operating Company:
at&t/SBC/Ameritech/Illinois BellCLLI:
MNHTILMARS0Switch Type:
Ribbon/Genband/Nortel Remote Switching CenterPrefixes Served:
(815) 478Notes:
Source: E. Stadick
Mazon
Listing Updated:
April 2020Operating Company:
at&t/SBC/Ameritech/Illinois BellCLLI:
MAZNILMZRS0Switch Type:
Nokia/Alcatel/Lucent 5ESS RemotePrefixes Served:
(815) 448Notes:
Source: FB
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Copyright 2020 Telephone Central Office Building
Pictures |