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Area Code 520
Telephone Central Office Building Pictures

The following are respresntative examples of telephone central office buildings in Area Code 520 (south/southeastern Arizona).

Click on the pictures below for a larger version.


Ajo

Listing Updated:
April 2011

Operating Company:
Table Top Telephone Co.

CLLI:
AJO AZXCDS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(520) 387

Notes:
Source: Craig L.

 

Benson

"Main"

Listing Updated:
December 2009

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
BNSNAZMADS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 586

Notes:
Source: Craig L.

 

Benson

"St. David"

Listing Updated:
December 2009

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
BNSNAZSDDS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 720

Notes:
Source: Craig L.

 

Bisbee

"Main"

Listing Updated:
December 2009

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
BISBAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 432

Notes:
Source: Craig L.

 

Bisbee

"Palominas Main"

Listing Updated:
August 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
PLMNAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 366

Notes:
Source: Craig L.

 

Bowie

Listing Updated:
February 2012

Operating Company:
Valley Telephone Cooperative

CLLI:
BOWIAZXCDS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 847

Notes:
Source: Craig L.

 

Casa Grande

"Arizona City"

Listing Updated:
November 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
AZCYAZ03RS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 494

Notes:
Source: Craig L.

 

Casa Grande

"Main"

Listing Updated:
October 2009

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
CSGRAZMADS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(520) 316, 374, 421, 423, 426, 836, 858, 876

Notes:
Source: Craig L.

 

Casa Grande

"Coolidge"

Listing Updated:
April 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
CLDGAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 723

Notes:
Source: Craig L.

 

Casa Grande

"Eloy"

Listing Updated:
December 2009

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
ELOYAZ01RS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 464, 466

Notes:
Source: Craig L.

 

Casa Grande

"Florence"

Listing Updated:
August 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
FLRNAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 866, 868

Notes:
Source: Craig L.

 

Casa Grande

"Maricopa"

Listing Updated:
October 2009

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
MRCPAZMADS0

Switch Type:
Digital Switch (unknown type)

Prefixes Served:
(520) 568

Notes:
Source: Craig L.

 

Casa Grande

"Stanfield"

Listing Updated:
August 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
STFDAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 424

Notes:
Source: Craig L.

 

Cascabel

Listing Updated:
September 2011

Operating Company:
Midvale Telephone Company

CLLI:
CSELAZXCDS0

Switch Type:
Redcom MDX 10K

Prefixes Served:
(520) 212

Notes:
Source: Craig L. This area did not have telephone service until 1993.

 

Douglas

Listing Updated:
May 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
DGLSAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 364, 368, 805

Notes:
Source: Craig L.

 

Elfrida

Listing Updated:
November 2011

Operating Company:
Copper Valley Telephone

CLLI:
ELFRAZXCDS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 642

Notes:
Source: Craig L.

 

Hayden

Listing Updated:
October 2009

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
HYDNAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 356

Notes:
Source: Craig L.

 

Hayden

"Dudleyville"

Listing Updated:
January 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
DDVLAZNMRS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 357

Notes:
Source: Craig L.

 

Hayden

"Kearny"

Listing Updated:
October 2009

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
KRNYAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 363

Notes:
Source: Craig L.

 

Lone Butte

Listing Updated:
August 2010

Operating Company:
Gila River Telecom

CLLI:
LNBTAZXCDS1

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 796

Notes:
This is the HQ of Gila River Telecom. This telephone company was started in the 1980s to offer better telephone service to the people of the Gila River nation. Source: Craig L.

 

Lone Butte

"Blackwater"

Listing Updated:
May 2011

Operating Company:
Gila River Telecom

CLLI:
BLWRAZXADS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 215

Notes:
Source: Craig L.

 

Lone Butte

"Casa Blanca"

Listing Updated:
October 2011

Operating Company:
Gila River Telecom

CLLI:
CSBLAZXADS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 315

Notes:
Source: Craig L.

 

Lone Butte

"Komatke"

Listing Updated:
February 2012

Operating Company:
Gila River Telecom

CLLI:
KMTKAZXADS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 550

Notes:
Source: Craig L.

 

Lone Butte

"Stotonic"

Listing Updated:
February 2012

Operating Company:
Gila River Telecom

CLLI:
STTNAZXADS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 418

Notes:
Source: Craig L.

 

Lone Butte

"Maricopa Village/Laveen"

Listing Updated:
December 2010

Operating Company:
Gila River Telecom

CLLI:
MRVGAZXCDS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 430

Notes:
Source: Craig L.

 

Lone Butte

"Sacaton"

Listing Updated:
August 2010

Operating Company:
Gila River Telecom

CLLI:
SCTNAZXCDS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 562

Notes:
Source: Craig L.

 

Nogales

"Main"

Listing Updated:
November 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
NGLSAZMARS1

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(520) 285, 287, 397

Notes:
Source: Craig L.

 

Nogales

"Midway"

Listing Updated:
November 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
NGLSAZMWDS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(520) 281, 375, 377, 761

Notes:
Source: Craig L.

 

Nogales

"Patagonia Main"

Listing Updated:
August 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
PTGNAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 394

Notes:
Source: Craig L.

 

Nogales

"Patagonia Elgin"

Listing Updated:
October 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
PTGNAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 455

Notes:
Source: Craig L.

 

Nogales

"Rio Rico"

Listing Updated:
February 2012

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
NGLSAZ03RS2

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
None

Notes:
A remote off of Nogales Midway but does not have any unique prefixes of its own. Source: Craig L.

 

Nogales

"Benedict Mountain"

Listing Updated:
February 2012

Operating Company:
Verizon Wireless

CLLI:
NGLSAZAGCM1

Switch Type:
Unknown

Prefixes Served:
None

Notes:
A mobile telephone switching office (MTSO) on a high remote mountain top. Source: Craig L.

 

Pearce

Listing Updated:
November 2011

Operating Company:
Valley Telephone Cooperative

CLLI:
PERCAZXCDS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 826

Notes:
Source: Craig L.

 

Portal

Listing Updated:
February 2012

Operating Company:
Valley Telephone Cooperative

CLLI:
PRTLAZXCDS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 558
(575) 557

Notes:
Also serves Rodeo, NM.
Source: Craig L.

 

San Manuel

Listing Updated:
January 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
SNMNAZMADS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(520) 385

Notes:
Source: Craig L.

 

San Manuel

"Mammoth"

Listing Updated:
October 2009

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
MMTHAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 487

Notes:
Source: Craig L.

 

San Manuel

"Oracle"

Listing Updated:
January 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
ORCLAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 896

Notes:
Source: Craig L.

 

San Simon

Listing Updated:
February 2012

Operating Company:
Valley Telephone Cooperative

CLLI:
SNSMAZXCDS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 845

Notes:
Source: Craig L.

 

Santa Rosa

Listing Updated:
January 2013

Operating Company:
Tohono O'Odham Utility Authority

CLLI:
SNRSAZXARS0

Switch Type:
Digital Switch (unknown type)

Prefixes Served:
(520) 361

Notes:
Source: Craig L.

 

Sasabe

Listing Updated:
June 2014

Operating Company:
TDA/Arizona Telephone Company

CLLI:
SASBAZXCDS0

Switch Type:
Redcom Labs MDX384

Prefixes Served:
(520) 823

Notes:
Source: Craig L.

 

Sells

Listing Updated:
April 2011

Operating Company:
Tohono O'odham Utility Authority

CLLI:
SLLSAZXADS1

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(520) 383

Notes:
Source: Craig L.

 

Sierra Vista

"Main"

Listing Updated:
August 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
SRVSAZMADS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(520) 417, 439, 452, 458-9, 515, 533, 538

Notes:
Source: Craig L.

 

Sierra Vista

"North"

Listing Updated:
August 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
SRVSAZNORS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 456

Notes:
Source: Craig L.

 

Sierra Vista

"South"

Listing Updated:
August 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
SRVSAZSODS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(520) 378, 803

Notes:
Source: Craig L.

 

Silverbell

"Eloy"

Photo 2

Listing Updated:
January 2012

Operating Company:
Midvale Telephone Company

CLLI:
ELOYAZ05DS0

Switch Type:
Redcom Laboratories IGM-MT

Prefixes Served:
(520) 898

Notes:
Source: Craig L.

 

Sunizona

Listing Updated:
November 2011

Operating Company:
Valley Telephone Cooperative

CLLI:
SNZNAZXCDS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 824

Notes:
Source: Craig L.

 

Superior

Listing Updated:
July 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
SPRRAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 689

Notes:
Source: Craig L.

 

Tombstone

Listing Updated:
December 2009

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TMBSAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 457

Notes:
Source: Craig L.

 

Tucson

"Catalina"

Photo 2

Listing Updated:
May 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZCADS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(520) 232, 299, 529, 577, 615

Notes:
Picture 2 shows some more detail of the door area and it's period stone work. Source: Craig L.

 

Tucson

"Coronado"

Photo 2

Listing Updated:
June 2011 / October 2009

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
CRNDAZMADS1

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(520) 818, 825

Notes:
Original photo taken October 2009 (Photo 2). Reshot in June 2011. Source: Craig L.

 

Tucson

"Cortaro"

Listing Updated:
November 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZCODS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(520) 572, 579, 744

Notes:
Source: Craig L.

 

Tucson

"Craycroft"

Photo 2

Listing Updated:
May 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZCRDS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(520) 512-4, 519, 570-1, 584, 745, 747-8, 750, 790

Notes:
Picture 2 shows some more detail of the decorative entry and tilework. Source: Craig L.

 

Tucson

"East"

Listing Updated:
August 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZEADS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(520) 318-27, 784, 795, 874, 881

Notes:
Source: Craig L.

 

Tucson

"Flowing Wells"

Listing Updated:
May 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZFWDS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(520) 292-3, 407-8, 690, 696,887-8

Notes:
Source: Craig L.

 

Tucson

"Green Valley"

Listing Updated:
August 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
GNVYAZMADS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(520) 393, 399, 625, 648

Notes:
Source: Craig L.

 

Tucson

"Marana Main"

Listing Updated:
May 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
MARNAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 616

Notes:
Source: Craig L.

 

Tucson

"Marana South"

Listing Updated:
October 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
MARNAZ03RS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 682

Notes:
Source: Craig L.

 

Tucson

"Marana West"

Listing Updated:
May 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
MARNAZ02RS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 665

Notes:
Source: Craig L.

 

Tucson

"Main"

Photo 2 | Photo 3

Photo 4 | Photo 5

Photo 6 | Photo 7

Listing Updated:
November 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZMADS1

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(520) 205-6, 209, 388, 594, 617, 620-4, 626, 628-9, 638, 670, 695, 740, 770, 791-2, 798, 838, 872, 879-80, 882, 884, 903

Notes:
Also home to an AT&T Long Lines tandem in the building next door (114-T).  Source: Craig L.

 

Tucson

"Mount Lemon"

Listing Updated:
October 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZMLRS2

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(520) 576

Notes:
Source: Craig L.

 

Tucson

"North"

Listing Updated:
May 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZNODS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(520) 218-9, 225, 229, 291, 297, 410, 469, 489, 498, 516, 531, 544, 566, 575, 712, 742, 793, 797, 877-8

Notes:
Source: Craig L.

 

Tucson

"Rincon"

Listing Updated:
May 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZRNDS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(520) 258, 290, 296, 298, 546, 721-2, 731, 733, 751, 873, 885-6

Notes:
Source: Craig L.

 

Tucson

"South"

Photo 2 | Photo 3

Listing Updated:
May 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZSODS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(520) 243, 294-5, 434, 573, 741, 746, 794, 799, 806-7, 889

Notes:
Picture 2 shows a straight shot of the entry, picture 3 is of the mailbox out front, still marked as Mountain Bell. Source: Craig L.

 

Tucson

"Southeast"

Listing Updated:
August 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZSEDS0

Switch Type:
Genband//Nortel DMS-100

Prefixes Served:
(520) 574, 662-4

Notes:
Source: Craig L.

 

Tucson

"Southwest"

Listing Updated:
May 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZSWDS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(520) 578, 822, 883, 908

Notes:
Source: Craig L.

 

Tucson

"Tanque Verde"

Listing Updated:
May 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZTVDS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(520) 749, 760

Notes:
Source: Craig L.

 

Tucson

"Tubac"

Listing Updated:
August 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TUBCAZMARS1

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(520) 398

Notes:
Source: Craig L.

 

Tuscon

"Vail North"

Listing Updated:
December 2009

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
VAILAZNORS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 647

Notes:
Source: Craig L.

 

Tuscon

"Vail South"

Listing Updated:
Septembe 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
VAILAZSODS0

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520)

Notes:
Source: Craig L.

 

Tucson

"West"

Listing Updated:
May 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
TCSNAZWERS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 743

Notes:
Source: Craig L.

 

West San Simon

"Santa Rosa"

Listing Updated:
April 2011

Operating Company:
Tohono O'odham Utility Authority

CLLI:
SNRSAZXCRS0

Switch Type:
DS (unknown type)

Prefixes Served:
(520) 362

Notes:
Source: Craig L.

 

Whitlow

Listing Updated:
July 2010

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
WHTLAZMADS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(520) 463

Notes:
Source: Craig L.

 

Willcox

Photo 2

Listing Updated:
November 2011

Operating Company:
CenturyLink/Qwest/US West/Mountain Bell

CLLI:
WLCXAZMARS1

Switch Type:
Genband/Nortel RSC

Prefixes Served:
(520) 384

Notes:
I wouldn't put a payment in the payment box in Photo 2. Source: Craig L.

 

 


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