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Area Code 530
Telephone Central Office Building Pictures

The following are representative examples of telephone central office buildings in Area Code 530 (Upper Northeastern California).

Click on the pictures below for a larger version.


Adin
 

Listing Updated:
August 2025

Operating Company:
Frontier/Citizens Communications

CLLI:
ADINCAXFRS0

Switch Type:
Ribbon/Genband/Nortel DMS-10 RLCM

Prefixes Served:
(530) 299

Notes:
Source: GSV

 

Alturas
 

Listing Updated:
August 2025

Operating Company:
Frontier/Citizens Communications

CLLI:
ALTRCAXFDS0

Switch Type:
Ribbon/Genband/Nortel DMS-10 Satellite Office

Prefixes Served:
(530) 233

Notes:
Source: GSV

 

Anderson
 

Listing Updated:
July 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
ARSNCA11DS1

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 365, 378

Notes:
Source: GSV

 

Auburn

"Main"
 

Listing Updated:
March 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
AUBNCA01DS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 745, 823, 885-9

Notes:
Source: GSV

 

Auburn

"Applegate"
 

Listing Updated:
February 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
AUBNCA11RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 878

Notes:
Source: GSV

 

Chico

"Main"
 

Listing Updated:
January 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
CHICCA01DS1

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 332, 342-3, 345, 566, 879, 891-9

Notes:
Source: GSV

 

Coleville

Photo 2
 

Listing Updated:
September 2024

Operating Company:
Frontier/Verizon/GTE

CLLI:
CEVLCAXFRS6

Switch Type:
Ribbon/Genband/Nortel RSC

Prefixes Served:
(530) 495

Notes:
Current source: GSV. Photo 2: Craig L. (July 2014)

 

Colfax

"Main"
 

Listing Updated:
January 2025

Operating Company:
Frontier/Verizon/GTE

CLLI:
CLFXCAXF34E

Switch Type:
Ribbon/Genband/Nortel DMS-10

Prefixes Served:
(530) 346

Notes:
Source: GSV

 

Colusa
 

Listing Updated:
June 2023

Operating Company:
Frontier/Citizens Communications

CLLI:
COLSCAXFDS0

Switch Type:
Ribbon/Genband/Nortel DMS-10 Host

Prefixes Served:
(530) 458

Notes:
Source: GSV

 

Corning
 

Listing Updated:
July 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
CRNGCA12RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 824, 838

Notes:
Source: GSV

 

Davis
 

Listing Updated:
May 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
DAVSCA11DS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(530) 297, 747, 750, 752-4, 756-9, 792

Notes:
Source: GSV

 

Dorris
 

Listing Updated:
May 2024

Operating Company:
Cal-Ore Telephone Company

CLLI:
DRRSCAABDS0

Switch Type:
Metaswitch VP3510 soft switch

Prefixes Served:
(530) 397-8, 664, 667

Notes:
Serves multiple ratecenters. Source: GSV

 

Downieville

"Main"
 

Listing Updated:
October 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
DWNVCA11RS1

Switch Type:
Ribbon/Genband/Nortel RSC

Prefixes Served:
(530) 289

Notes:
Source: GSV

 

Dunsmuir

Photo 2 | Photo 3
 

Listing Updated:
December 2023

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
DNSMCA11RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 235

Notes:
Current source: GSV. Photo 3: Bob H. (August 2016)

 

Etna
 

Listing Updated:
September 2024

Operating Company:
Siskiyou Telephone Company

CLLI:
ETNACAXF467

Switch Type:
Ribbon/Genband/Nortel DMS-10

Prefixes Served:
(530) 467

Notes:
Source: GSV

 

Foresthill
 

Listing Updated:
January 2025

Operating Company:
Sebastian/Foresthill Telephone Company

CLLI:
FRHLCAXFDS0

Switch Type:
Ribbon/Genband/Nortel C1500

Prefixes Served:
(530) 367

Notes:
Source: GSV

 

Fort Jones
 

Listing Updated:
August 2024

Operating Company:
Siskiyou Telephone Company

CLLI:
FTJNCAXF468

Switch Type:
Ribbon/Genband/Nortel DMS-10

Prefixes Served:
(530) 468

Notes:
Source: GSV

 

Grass Valley

"Main"
 

Listing Updated:
June 2023

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
GRVYCA01DS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(530) 271-4, 477

Notes:
Source: GSV

 

Grass Valley

"Penn Valley"
 

Listing Updated:
March 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
GRVYCA12DS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(530) 432

Notes:
Source: GSV

 

Grass Valley

"South"
 

Listing Updated:
January 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
GRVYCA11RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 268-9

Notes:
Also serves parts of Auburn North. Source: GSV

 

Greenville
 

Listing Updated:
2015

Operating Company:
Frontier/Citizens

CLLI:
(was GNVLCAXFDS0)

Switch Type:
Nokia/Siemens DCO Remote

Prefixes Served:
(530) 284

Notes:
The entire town suffered a catastrophic fire in 2021. This Co building and more than 75% of the buildings in town were burned to the ground. Source: Bing Maps (2015)

 

Gridley
 

Listing Updated:
June 2023

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
GRDLCA11DS1

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(530) 846

Notes:
Source: GSV

 

Guinda
 

Listing Updated:
March 2021

Operating Company:
Frontier/Global Valley Networks

CLLI:
GUNDCAXGDS0

Switch Type:
Ribbon/Genband/Nortel DMS-10

Prefixes Served:
(530) 796

Notes:
Source: GSV

 

Homewood
 

Listing Updated:
April 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
HMWDCA11RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 525

Notes:
Source: GSV

 

Marysville

"Main"
 

Listing Updated:
May 2023

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
MYVICA01DS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(530) 634, 740-3, 749

Notes:
Source: GSV

 

Marysville

"Yuba City"
 

Listing Updated:
May 2023

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
YBCYCA01DS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(530) 671, 673-4, 751, 755, 790, 821-2

Notes:
Source: GSV

 

Millville

"Palo Cedro"
 

Listing Updated:
August 2025

Operating Company:
Frontier/Citizens Communications

CLLI:
PLCDCAXFDS0

Switch Type:
Nokia/Siemens/Stromberg-Carlson DCO

Prefixes Served:
(530) 547

Notes:
Source: GSV

 

Mount Shasta
 

Listing Updated:
August 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
MTSHCA12DS1

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 918, 926

Notes:
Source: GSV

 

Nevada City
 

Listing Updated:
October 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
NVCYCA11DS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(530) 265, 470, 478

Notes:
Source: GSV

 

North Tahoe

"Brockway"
 

Listing Updated:
April 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
BCWYCA11RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 546

Notes:
Source: GSV

 

North Tahoe

"Tahoe City"
 

Listing Updated:
June 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
THCYCA01DS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 581, 583-4

Notes:
Source: GSV

 

Olinda
 

Listing Updated:
August 2025

Operating Company:
TDS/Happy Valley Telephone Company

CLLI:
OLNDCAXEPS0

Switch Type:
Packet End Office (unknown type)

Prefixes Served:
(530) 357, 396

Notes:
Source: GSV

 

Oroville

"Main"
 

Listing Updated:
June 2023

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
ORVLCA11DS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 532-4, 538

Notes:
Source: GSV

 

Oroville

"Lake Oroville"
 

Listing Updated:
September 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
ORVLCA12RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 589

Notes:
Source: GSV

 

Paradise

"Main"
 

Listing Updated:
August 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
PRDSCA11DS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 872, 876-7

Notes:
Source: GSV

 

Placerville

"Kyburz"
 

Listing Updated:
April 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
KYBRCA11RS1

Switch Type:
Ribbon/Genband/Nortel RSC

Prefixes Served:
(530) 293

Notes:
Source: GSV

 

Placerville West

"Main"
 

Listing Updated:
April 2023

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
PLVLCA11DS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(530) 295, 344, 621-2, 626, 642

Notes:
Source: GSV

 

Placerville West

"Cedar Grove"
 

Listing Updated:
December 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
PLVLCA12DS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(530) 644, 647

Notes:
Source: GSV

 

Quincy

Photo 2
 

Listing Updated:
October 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
QNCYCA12RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 283

Notes:
Current source: GSV. Photo 2: Craig L. (August 2016)

 

Rancho Tehama
 

Listing Updated:
August 2023

Operating Company:
Varcomm/Ducor Telephone Company

CLLI:
RNTHCAXFDS1

Switch Type:
Nokia/Siemens/Stromberg-Carlson DCO

Prefixes Served:
(530) 585

Notes:
Source: GSV

 

Red Bluff
 

Listing Updated:
October 2023

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
RDBLCA01DS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 527-9

Notes:
Source: GSV

 

Redding

"Main"
 

Listing Updated:
July 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
RDNGCA02DS1

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 225, 229, 241-7, 339

Notes:
Source: GSV

 

Redding

"Central Valley"
 

Listing Updated:
August 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
CNVYCA11RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 275-6

Notes:
Source: GSV

 

Redding

"Enterprise"
 

Listing Updated:
July 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
RDNGCA11DS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 221-4, 226, 722

Notes:
Source: GSV

 

Shingle Springs
 

Listing Updated:
November 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
SGSPCA11DS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 672, 676-7

Notes:
Source: GSV

 

South Tahoe

"Sussex"

 

Listing Updated:
April 2019

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
STAHCA01DS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 541-4

Notes:
Source: GSV

 

South Tahoe

"Tahoe Paradise"
 

Listing Updated:
April 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
STAHCA13RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 573, 577

Notes:
Source: GSV

 

South Tahoe

"Tamarack"
 

Listing Updated:
April 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
STAHCA12RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 659

Notes:
Source: GSV

 

Susanville
 

Listing Updated:
October 2024

Operating Company:
Frontier/Citizens Communications

CLLI:
SSVLCAXFDS0

Switch Type:
Ribbon/Genband/Nortel DMS-100/200

Prefixes Served:
(530) 251, 257

Notes:
Source: GSV

 

Trinity Center
 

Listing Updated:
July 2025

Operating Company:
TDS/Happy Valley Telephone Company

CLLI:
TRCTCAXFPS0

Switch Type:
Packet End Office (unknown type)

Prefixes Served:
(530) 266, 286

Notes:
Also serves Minersville ratecenter. Source: GSV

 

Truckee

"Main"

Photo 2 | Photo 3
 

Listing Updated:
April 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
TRUCCA11DS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 550, 582, 587

Notes:
Curent photo: GSV. Photos 2 and 3: Craig L. (July 2014)

 

Truckee

"Northstar"
 

Listing Updated:
April 2025

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
TRUCCA12RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 562

Notes:
Source: GSV

 

Weaverville
 

Listing Updated:
July 2025

Operating Company:
Frontier/Verizon/GTE

CLLI:
WVVLCAXGDS0

Switch Type:
Ribbon/Genband/Nortel DMS-100

Prefixes Served:
(530) 623

Notes:
Source: GSV

 

Weed
 

Listing Updated:
August 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
WEEDCA01RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 938

Notes:
Source: GSV

 

Willows
 

Listing Updated:
December 2023

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
WLWSCA11RS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS Remote

Prefixes Served:
(530) 934

Notes:
Source: GSV

 

Woodland
 

Listing Updated:
December 2022

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
WDLDCA11DS0

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 406, 661-2, 666, 668-9

Notes:
Source: GSV

 

Yreka
 

Listing Updated:
August 2024

Operating Company:
at&t/SBC/Pacific Telesis/Pacific Telephone

CLLI:
YREKCA11DS1

Switch Type:
Nokia/Alcatel/Lucent 5ESS

Prefixes Served:
(530) 841-2

Notes:
Source: GSV

 

Visit other California Area Codes: 209 213 310 323 408 415 510 530 559 562 619 626 650 661 707 714 760 805 818 831 858 909 916 925 949 951

Visit nearby regions: Arizona Nevada Oregon


Copyright 2025 Telephone Central Office Building Pictures
Page last modified October 26, 2025
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