Area Code 920
Telephone Central Office Building Pictures

The following are representative examples of telephone central office buildings in Area Code 920 (Eastern Wisconsin).

Click on the pictures below for a larger version.

Abrams Photo 2 | Photo 3	Listing Updated: August 2011 Operating Company: Nsight/Bayland Telephone CLLI: (was ABRMWIXADS0) Switch Type: Tekelec T7000 remote Prefixes Served: (920) 826 Notes: Originally was a DMS-10, now a packet switch remote. Photo 2 shows the back of the main building, while Photo 3 shows the garage next to the main building.
Algoma Photo 2	Listing Updated: August 2023 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: ALGMWI11RS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (920) 365, 487 Notes: Source: Ed S.
Appleton "Main"	Listing Updated: October 2024 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: APPLWI01DS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (920) 221, 225, 257, 380, 628, 730-1, 733-5, 738-9, 749, 830-2, 954, 991, 993, 996-7 Notes: Source: GSV
Appleton "Greenville"	Listing Updated: October 2024 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: GNVLWI12RS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (920) 757 Notes: Source: GSV
Baileys Harbor	Listing Updated: August 2020 Operating Company: Frontier/Verizon/GTE CLLI: BLHRWIXARS0 Switch Type: Nokia/Alcatel/Lucant/Automatic Electric GTD-5 EAX Remote Prefixes Served: (920) 839 Notes: Source: Ed S.
Beaver Dam Photo 2 | Photo 3	Listing Updated: July 2024 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: BVDMWI01DSA Switch Type: Nokia/Alcatel/Lucent 5ESS Host Prefixes Served: (920) 356, 689, 885, 887 Notes: Also serves the Burnett ratecenter. Was originally a #1 Step by Step, now a Lucent 5ESS. Photo 2 shows a microwave dish pointed to the microwave relay station in Slinger, WI. Source: Joe M.
Berlin	Listing Updated: August 2014 Operating Company: Brightspeed/Centurylink/CenturyTel CLLI: BRLNWI01DS0 Switch Type: Ribbon/Genband/Nortel DMS-10 Prefixes Served: (920) 361 Notes: Source: Joe M.
Brandon	Listing Updated: May 2014 Operating Company: Brightspeed/Centurylink/CenturyTel/Fairwater-Brandon-Alto Telephone Co. CLLI: BRNDWIXBRS0 Switch Type: Remote Switch (unknown type) Prefixes Served: (920) 346 Notes: Originally had an AE Step by Step switch. Source: Joe M.
Campbellsport Photo 2	Listing Updated: April 2024 Operating Company: Frontier/VerizonGTE CLLI: CMPTWIXARS0 Switch Type: Nokia/Lucent/Automatic Electric GTD-5 RSU Prefixes Served: (920) 533 Notes: Was an AE SXS until 1982, then  ITS-5 Host until 2005, now an AE remote off GTD-5 in Oak Field, WI. Was one of the first switches in GTE to be digital. Current photo: GSV. Photo 2: Joe M. (September 2007)
Casco	Listing Updated: August 2023 Operating Company: Brightspeed/CenturyLink/CenturyTel (Casco) CLLI: CASCWIXADS0 Switch Type: Nokia/Siemens/Stromberg-Carlson DCO Prefixes Served: (920) 837 Notes: Source: GSV
Cedar Grove	Listing Updated: September 2020 Operating Company: Frontier/Verizon/GTE CLLI: CDGVWIXARS0 Switch Type: Nokia/Lucent/Automatic Electric GTD-5 RSU Prefixes Served: (920) 668 Notes: Source: Ed S.
Cleveland	Listing Updated: July 2024 Operating Company: TDS/Eastcoast Telecom CLLI: CLEVWIXAPS0 Switch Type: Packet End Office (unknown type) Prefixes Served: (920) 300, 693 Notes: Source: GSV
Clyman Photo 2	Listing Updated: July 2024 Operating Company: Frontier/Verizon/GTE CLLI: CLYMWIXARL0 Switch Type: Nokia/Lucent/Automatic Electric GTD-5 Remote Prefixes Served: (920) 696 Notes: Current photo: GSV. Photo 2: Joe M. (July 2015)
De Pere	Listing Updated: July 2023 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: DEPRWI11DS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (920) 330, 336-9, 343, 403, 983 Notes: Source: GSV
Denmark	Listing Updated: June 2023 Operating Company: Brightspeed/CenturyLink/CenturyTel Central Wisconsin CLLI: DNMKWIXADS0 Switch Type: Nokia/Alcatel/Lucent/Automatic Electric GTD5-EAX Prefixes Served: (920) 863 Notes: Source: GSV
Fond du Lac Photo 2	Listing Updated: April 2024 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: FDULWI01DS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (920) 266, 906-7, 921-4, 926, 929 Notes: Current photo: GSV. Photo 2: Joe M. (June 2016)
Forestville	Listing Updated: August 2020 Operating Company: Brightspeed/Centurylink/CenturyTel CLLI: FSVLWIXADS0 Switch Type: Digital Switch (unknown type) Prefixes Served: (920) 856 Notes: Source: E. Stadick
Fox Lake Photo 2 | Photo 3	Listing Updated: July 2024 Operating Company: Brightspeed/Centurylink/CenturyTel/People's Telephone CLLI: FXLKWIXARS0 Switch Type: Nokia/Alcatel/Lucent 5ESS remote Prefixes Served: (920) 928 Notes: Before 1995 was People's Telephone Co. Was A DMS-10 Now is a AT&T 5ESS Remote. Current photo: GSV. Photos 2 and 3: Joe M. (June 2011 and March 2009)
Gillett	Listing Updated: June 2023 Operating Company: Brightspeed/CenturyLink/Telephone USA of Wisconsin CLLI: GLLTWIXADS0 Switch Type: Nokia/Alcatel/Lucent/Automatic Electric GTD5-EAX Prefixes Served: (920) 855 Notes: Source: GSV
Green Bay "Cardinal" Photo 2	Listing Updated: May 2023 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: GNBYWI13DS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (920) 434, 661-2 Notes: Serves western parts of Green Bay ratecenter. Current photo: GSV. Photo 2: August 2011
Green Bay "Huth"	Listing Updated: July 2023 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: GNBYWI12DS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (920) 288, 406, 465, 468-9 Notes: Source: GSV
Green Bay "Jefferson" Photo 2	Listing Updated: August 2019 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: GNBYWI01DS1 GNBYWI01DSA Switch Type: DS1: Ribbon/Genband/Nortel DMS-100 DSA: Nokia/Alcatel/Lucent 5ESS Prefixes Served: DS1: (920) 430-3, 435-8, 444-5, 455 DSA: (920) 448 Notes: Current photo: GSV. Photo 2: January 2017
Green Bay "Ridge" Photo 2	Listing Updated: July 2023 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: GNBYWI11DS0 GNBYWI11DSA GNBYWI11RS0 Switch Type: DS0 & DSA: Ribbon/Genband/Nortel DMS-100 RS0: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: DS0: (920) 327 DSA: (920) 405, 429, 490-1, 494, 496-9, 592 RS0: (920) 492 Notes: Serves northwestern parts of Green Bay ratecenter. Current photo: GSV. Photo 2: August 2011
Green Lake	Listing Updated: September 2021 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: GNLKWI11DS1 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (920) 294 Notes: Source: Ed S.
Horicon Photo 2	Listing Updated: July 2024 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: HRCNWI11RS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (920) 485 Notes: Current photo: GSV. Photo 2: Joe M. (August 2014)
Hustisford Photo 2	Listing Updated: July 2024 Operating Company: Frontier/Verizon/GTE CLLI: HSFDWIXARS0 Switch Type: Nokia/Lucent/Automatic Electric GTD-5 Remote Prefixes Served: (920) 349 Notes: Current photo: GSV. Photo 2: Joe M. (July 2015)
Jefferson	Listing Updated: June 2024 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: JFSNWI11RS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (920) 674-5 Notes: Source: GSV
Johnson Creek	Listing Updated: September 2012 Operating Company: TDS/Riverside Telcom CLLI: JHCKWIXAPS0 Switch Type: Packet End Office (unknown type) Prefixes Served: (920) 699 Notes: Source: GSV
Juneau	Listing Updated: July 2024 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: JUNEWI11RS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (920) 386 Notes: Source: GSV
Kewaunee Photo 2	Listing Updated: August 2023 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: KEWNWI11RS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (920) 388 Notes: Current photo: GSV. Photo 2: August 2020 (Ed S.)
Lake Mills	Listing Updated: June 2024 Operating Company: Frontier/Verizon/GTE CLLI: LKMLWIXADS0 Switch Type: Nokia/Alcatel/Lucent/Automatic Electric GTD5-EAX Prefixes Served: (920) 648 Notes: Source: GSV
Larsen Photo 2	Listing Updated: October 2024 Operating Company: Brightspeed/Centurylink/CenturyTel/Larsen-Readfield Telephone Co CLLI: LRSNWIXADSA Switch Type: Nokia/Siemens DCO Prefixes Served: (920) 836 Notes: Current photo: GSV. Photo 2: Joe M. (June 2016)
Lebanon Photo 2	Listing Updated: July 2024 Operating Company: Frontier/Verizon/GTE CLLI: LBNNWIXARL0 Switch Type: Nokia/Lucent/Automatic Electric GTD-5 Remote Prefixes Served: (920) 925 Notes: Current photo: GSV. Photo 2: Joe M. (July 2015)
Lena Photo 2	Listing Updated: August 2023 Operating Company: Brightspeed/Centurylink/CenturyTel CLLI: LENAWIXARS0 Switch Type: Ribbon/Genband/Nortel RSC Prefixes Served: (920) 829 Notes: Current photo: GSV. Photo 2: August 2011
Lomira Photo 2	Listing Updated: May 2024 Operating Company: Frontier/Verizon/GTE CLLI: LOMRWIXARS6 Switch Type: Remote Switch (unknown type) Prefixes Served: (920) 269 Notes: One of the first Vidar remote digital offices. It was a remote off of a Vidar switch in Campbelsport, WI circa 1978. It had replaced an outgrown Nokia/Lucent/Automatic Electric Step by Step switch. Though the exact switch is not known, it now appears to be an AE GTD-5 remote hosted in Oakfield. Current photo: GSV. Photo 2: Joe M. (August 2014)
Manitowoc	Listing Updated: October 2022 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: MNTWWI01DS0 Switch Type: Nokia/Siemens EWSD DE5 Prefixes Served: (920) x Notes: Source: GSV
Mapleton Photo 2	Listing Updated: May 2024 Operating Company: Frontier/Verizon/GTE CLLI: MPTNWIXARS0 Switch Type: Nokia/Lucent/Automatic Electric GTD-5 Remote Prefixes Served: (920) 355, 474 Notes: Manual until 1957, then a Leich all-relay switch was installed. Current building built in 1969 for an  Nokia/Lucent/Automatic Electric step by step. In 1991, current switch installed. Current photo: GSV. Photo 2: Joe M. (May 2015)
Markesan	Listing Updated: October 2008 Operating Company: Brightspeed/CenturyLink/CenturyTel Central Wisconsin CLLI: MRKSWIXADS0 Switch Type: Nokia/Alcatel/Lucent/Automatic Electric GTD5-EAX Prefixes Served: (920) 398 Notes: Source: GSV
Mayville Photo 2	Listing Updated: July 2024 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: MYVLWI11RS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (920) 387 Notes: Current photo: GSV. Photo 2: Joe M. (July 2015)
Neenah Photo 2	Listing Updated: October 2024 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: NENHWI11DS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (920) 215, 720-2, 725, 727, 729, 751, 969 Notes: Current photo: GSV. Photo 2: Joe M. (June 2016)
Neosho Photo 2	Listing Updated: May 2024 Operating Company: Frontier/Verizon/GTE CLLI: NESHWIXARS0 Switch Type: Nokia/Lucent/Automatic Electric GTD-5 Remote Prefixes Served: (920) 368, 625 Notes: Current photo: GSV. Photo 2: Joe M. (July 2015)
Newtonburg	Listing Updated: July 2024 Operating Company: Nsight/Lakefield Telephone Company CLLI: NTBGWIXADSA Switch Type: Nokia/Siemens/Stromberg-Carlson DCO Prefixes Served: (920) 663, 726, 758 Notes: Serves multiple ratecenters. Source: GSV
Oakfield	Listing Updated: May 2024 Operating Company: Frontier/Verizon/GTE CLLI: OKFDWIXADS0 Switch Type: Nokia/Alcatel/Lucent/Automatic Electric GTD5-EAX Prefixes Served: (920) 583 Notes: Source: GSV
Oconto Photo 2	Listing Updated: June 2023 Operating Company: Brightspeed/Centurylink/CenturyTel/Ameritech/ Wisconsin Telephone CLLI: OCNTWI11RS1 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote (EXM) Prefixes Served: (920) 834 Notes: Oconto is part of a group of ratecenters that were sold to CenturyTel from Ameritech a number of years ago. Current photo: GSV. Photo 2: August 2011
Oconto Falls Photo 2	Listing Updated: June 2023 Operating Company: Brightspeed/Centurylink/CenturyTel/Ameritech/ Wisconsin Telephone CLLI: OCFLWI11RS1 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote (EXM) Prefixes Served: (920) 846 Notes: Oconto Falls is part of a group of ratecenters that were sold to CenturyTel from Ameritech a number of years ago. Current photo: GSV. Photo 2: August 2011
Omro	Listing Updated: June 2016 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: OMROWI11DS0 Switch Type: Ribbon/Genband/Nortel DMS-10 Prefixes Served: (920) 685 Notes: Source: Joe M.
Oostburg	Listing Updated: September 2020 Operating Company: Frontier/Verizon/GTE CLLI: OSBGWIXARS0 Switch Type: Nokia/Lucent/Automatic Electric GTD-5 RSU Prefixes Served: (920) 564 Notes: Source: Ed S.
Oshkosh Photo 2	Listing Updated: July 2019 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: OSHKWI01DSA Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (920) 223, 231-3, 235-7, 303, 424, 426, 527 Notes: Current photo: GSV. Photo 2: Joe M. (June 2016)
Plymouth	Listing Updated: June 2024 Operating Company: Frontier/Verizon/GTE CLLI: PLMOWIXADS0 Switch Type: Nokia/Alcatel/Lucent/Automatic Electric GTD5-EAX Prefixes Served: (920) 892 Notes: Source: GSV
Princeton Photo 2	Listing Updated: September 2023 Operating Company: Brightspeed/Centurylink/CenturyTel CLLI: PRTNWI11DS0 Switch Type: Ribbon/Genband/Nortel DMS-10 Prefixes Served: (920) 295 Notes: Current photo: GSV. Photo 2: September 2012
Randolph Photo 2	Listing Updated: March 2009 Operating Company: Brightspeed/Centurylink/CenturyTel/People's Telephone CLLI: RNDHWIXBDS1 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (920) 326 Notes: Before 1995 was People's Telephone Company.  Was A DMS-10 now a AT&T 5ESS. Photo 2 is the old CO building before the new one was built. Source: Joe M.
Random Lake	Listing Updated: September 2020 Operating Company: Frontier/Verizon/GTE CLLI: RNLKWIXADS0 Switch Type: Nokia/Alcatel/Lucant/Automatic Electric GTD-5 EAX Prefixes Served: (920) 994 Notes: Source: Ed S.
Redgranite	Listing Updated: August 2014 Operating Company: Brightspeed/Centurylink/CenturyTel CLLI: RDGRWI11DS0 Switch Type: Ribbon/Genband/Nortel DMS-10 Prefixes Served: (920) 566 Notes: Source: Joe M.
Ripon Photo 2	Listing Updated: August 2018 Operating Company: Brightspeed/Centurylink/CenturyTel/PTI/Northwest Telephone CLLI: RIPNWIXADS2 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (920) 745, 748 Notes: Originally a Stromberg-Carlson XY switch. Current photo: GSV. Photo 2: Joe M. (May 2014)
Seymour	Listing Updated: June 2023 Operating Company: Brightspeed/CenturyLink/CenturyTel Central Wisconsin CLLI: SYMRWIXADS0 Switch Type: Nokia/Alcatel/Lucent/Automatic Electric GTD5-EAX Prefixes Served: (920) 833 Notes: Source: GSV
Sheboygan	Listing Updated: June 2024 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: SHBYWI01DS0 Switch Type: Nokia/Siemens EWSD DE5 Prefixes Served: (920) 208, 395, 451-3, 457-9, 803 Notes: Source: GSV
Sheboygan Falls	Listing Updated: June 2024 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: SHFLWI12DS0 Switch Type: Nokia/Siemens EWSD DE4 Prefixes Served: (920) 467 Notes: Source: GSV
Sherwood	Listing Updated: October 2024 Operating Company: TDS/Stockbridge & Sherwood Telephone Company CLLI: SHWDWIXAPS0 Switch Type: Packet End Office (unknown type) Prefixes Served: (920) 989 Notes: Source: GSV
Sister Bay Photo 2	Listing Updated: August 2020 Operating Company: Frontier/Verizon/GTE CLLI: SSBYWIXADS0 Switch Type: Nokia/Alcatel/Lucant/Automatic Electric GTD-5 EAX Remote Prefixes Served: (920) 854 Notes: Source: Ed S.
Sturgeon Bay	Listing Updated: August 2020 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: STBYWI11RS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (920) 743, 746 Notes: Source: Ed S.
Theresa Photo 2	Listing Updated: October 2024 Operating Company: Frontier/Verizon/GTE CLLI: THRSWIXARS4 Switch Type: Remote Switch (unknown type) Prefixes Served: (920) 276, 488 Notes: Current photo: GSV. Photo 2: Joe M. (July 2015)
Tisch Mills	Listing Updated: September 2009 Operating Company: TDS/Stockbridge & Sherwood Telephone Company CLLI: TSMLWIXAPS0 Switch Type: Packet End Office (unknown type) Prefixes Served: (920) 776 Notes: Source: GSV
Two Rivers	Listing Updated: August 2020 Operating Company: Frontier/Verizon/GTE CLLI: TWRVWIXADS0 Switch Type: Nokia/Alcatel/Lucant/Automatic Electric GTD-5 EAX Prefixes Served: (920) 793-4 Notes: Source: Ed S.
Watertown Photo 2 | Photo 3	Listing Updated: July 2024 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: WTTWWI01DSA Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (920) 206, 261-2 Notes: Originally had a #5 Crossbar switch. Current photo: GSV. Photos 2 and 3: Joe M. (May 2014)
Waupun Photo 2	Listing Updated: May 2024 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: WAPNWI11RS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (920) 324 Notes: Originally had a CDO step by step switch. Current photo: GSV. Photo 2: Joe M. (May 2014)
Wautoma	Listing Updated: August 2014 Operating Company: Brightspeed/Centurylink/CenturyTel CLLI: WTMAWIXADS0 Switch Type: Nokia/Lucent/Automatic Electric GTD-5 Prefixes Served: (920) 787 Notes: Source: Joe M.
Weyauwega Photo 2	Listing Updated: October 2018 Operating Company: Brightspeed/Centurylink/CenturyTel CLLI: WYWGWIXADS0 Switch Type: Ribbon/Genband/Nortel DMS-10 Prefixes Served: (920) 867 Notes: Current photo: GSV. Photo 2: Joe M. (June 2011)
Wild Rose	Listing Updated: October 2021 Operating Company: Brightspeed/Centurylink/CenturyTel CLLI: WLDRWIXADS1 Switch Type: Ribbon/Genband/Nortel DMS-10 Host Prefixes Served: (920) 622 Notes: Source: Joe M.
Winneconne	Listing Updated: June 2016 Operating Company: at&t/SBC/Ameritech/Wisconsin Telephone CLLI: WNCNWI11DS0 Switch Type: Ribbon/Genband/Nortel DMS-10 Prefixes Served: (920) 582 Notes: Source: Joe M.

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