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Area Codes 303 & 720
Telephone Central Office Building Pictures

The following are representative examples of telephone central office buildings in Area Codes 303 & 720 (Colorado).

Click on the pictures below for a larger version.


Deer Trail
 

Listing Updated:
November 2011

Operating Company:
Bijou Telephone Cooperative

CLLI:
DRTRCOXCRS1

Switch Type:
Genband/Nortel 1RE

Prefixes Served:
(303) 769

Notes:
Source: GSV

 

Denver

"Main"

Photo 2 3 4 5
 

Listing Updated:
August 2012

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

CLLI:
DNVRCOMADS0
DNVRCOMADS4
DNVRCOMADS9

Switch Type:
DS0: Alcatel/Lucent 5ESS
DS4: ACD
DS9: Alcatel/Lucent 5ESS

Prefixes Served:
DS0: (303) 260, 352, 389, 405, 436, 446, 454, 534, 556, 571-3, 575, 585, 592, 595, 602-3, 605-8, 615, 620, 623-4, 626, 628-31, 633-4, 640, 685, 820, 825, 844, 892-3, 899
(720) 359, 362, 931, 944

DS4: (303) 787

DS9: (720) 904, 932, 946, 956

Notes:
Source: Nathan H.

 

Denver

"East"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCOEADS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(303) 270, 314-6, 320-2, 329, 331, 333, 336, 355, 370, 372, 377, 388, 393-4, 398-9, 780
(720)  941-2, 945

Notes:
Source: GSV

 

Denver

"North"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCONODS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(303) 433, 455, 477, 480, 561, 964
(720) 854-5

Notes:
Source: GSV

 

Denver

"Northeast"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCONEDS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(303) 227, 286-9, 853
(720) 322

Notes:
Source: GSV

 

Denver

"South"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCOSODS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(303) 281-2, 698, 715, 722, 733, 744, 765, 777-8, 871
(720) 570

Notes:
Source: GSV

 

Denver

"Southeast"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCOSEDS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(303) 300, 504, 512, 584, 639, 691-2, 753, 756-9, 782
(720) 242, 524

Notes:
Source: GSV

 

Denver

"Southwest"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCOSWDS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(303) 716, 763, 914, 969, 980, 984-9
(720) 962-3

Notes:
Source: GSV

 

Denver

"West"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCOWSDS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(303) 727, 742, 922, 934-7, 975
(720) 884

Notes:
Source: GSV

 

Denver

"Arvada"
 

Listing Updated:
December 2016

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

CLLI:
ARVDCOMADS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(303) 403, 420-5, 431-2, 456, 463, 467, 940
(720) 898

Notes:
Source: GSV

 

Denver

"Aurora"
 

Listing Updated:
December 2016

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

CLLI:
AURRCOMADS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(303) 326, 340-1, 343-4, 360-1, 363-7, 676-7, 724, 739, 553, 777, 847-8, 857-9

Notes:
Source: GSV

 

Denver

"Boulder - Main"
 

Listing Updated:
December 2016

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

CLLI:
BLDRCOMADS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(303) 245, 247, 401-2, 413, 415, 417, 440-4, 447-9, 473, 492, 541, 544-6, 735, 786, 924, 938-9, 966, 998
(720) 406, 561-5

Notes:
Source: GSV

 

Denver

"Boulder - Gunbarrel"
 

Listing Updated:
December 2016

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

CLLI:
BLDRCOGBRS1

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(303) 516, 527, 530, 581
(720) 622

Notes:
Source: GSV

 

Denver

"Broomfield"
 

Listing Updated:
December 2016

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

CLLI:
BRFDCOMADS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(303) 272, 404, 410, 438-9, 460, 464-6, 469, 533, 635
(720) 558, 566, 887

Notes:
Source: GSV

 

Denver

"Capitol Hill"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCOCHDS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(303) 318, 764, 812-3, 830-2, 837, 839, 860-1, 863-4, 869, 894
(720) 423-4, 426, 917, 947

Notes:
Source: GSV

 

Denver

"Castle Rock"
 

Listing Updated:
December 2016

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

CLLI:
CSRKCONMDS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(303) 660, 663, 688, 814
(720) 455, 733

Notes:
Source: GSV

 

Denver

"Central City"
 

Listing Updated:
December 2016

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

CLLI:
CNCYCOMARS1

Switch Type:
Ericsson AXE-10 Remote

Prefixes Served:
(303) 582

Notes:
Source: GSV

 

Denver

"Columbine"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCOCLDS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(303) 904, 932-3, 948, 971-3, 977-9
(720) 922, 981

Notes:
Source: GSV

 

Denver

"Curtis Park"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCOCPDS0

Switch Type:
Alcatel/Lucent 5ES

Prefixes Served:
(303) 244, 291-9, 308, 312-3, 380, 382-3, 391, 672, 675, 896, 965, 992
(720) 264, 578

Notes:
Source: GSV

 

Denver

"Dry Creek"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCODCDS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(303) 220-1, 224, 265, 267, 290, 486, 488, 689, 694, 712-4, 721, 737, 740-1, 770-1, 773, 779, 793, 796, 804, 843, 846, 850, 889, 930, 967
(720) 489, 528, 536, 554

Notes:
Source: GSV

 

Denver

"Englewood"
 

Listing Updated:
December 2016

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

CLLI:
ENWDCOMADS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(303) 761-2, 781, 783, 788-9, 806
(720) 833

Notes:
Source: GSV

 

Denver

"Erie"
 

Listing Updated:
December 2016

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

CLLI:
ERIECOMARS1

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(303) 828

Notes:
Source: GSV

 

Denver

"Evergreen"
 

Listing Updated:
December 2016

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

CLLI:
EVRGCOMADS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(303) 670, 674, 679

Notes:
Source: GSV

 

Denver

"Frederick"
 

Listing Updated:
December 2016

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

CLLI:
FRDRCOMADS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(303) 833

Notes:
Source: GSV

 

Denver

"Golden"
 

Listing Updated:
December 2016

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

CLLI:
GLDNCOMADS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(303) 215-6, 271, 273, 277-9, 384, 982
(720) 497

Notes:
Source: GSV

 

Denver

"Idaho Springs"
 

Listing Updated:
December 2016

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

CLLI:
IDSPCOMADS0

Switch Type:
Ericsson AXE-10 Host

Prefixes Served:
(303) 567

Notes:
Source: GSV

 

Denver

"Lakewood"
 

Listing Updated:
December 2016

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

CLLI:
LKWDCOMADS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(303) 202, 205, 231-9, 274-5, 445, 462
(720) 321, 544

Notes:
Source: GSV

 

Denver

"Larkspur"
 

Listing Updated:
December 2016

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

CLLI:
LRKSCONMRS1

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(303) 681

Notes:
Source: GSV

 

Denver

"Littleton Main"
 

Listing Updated:
December 2016

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

CLLI:
LTTNCOMADS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(303) 347, 658, 703, 707, 730, 734, 738, 794-5, 797-8
(720) 283

Notes:
Source: GSV

 

Denver

"Montebello"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCOMBDS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(303) 307, 371, 373, 375, 574, 576
(720) 374

Notes:
Source: GSV

 

Denver

"Nederland"
 

Listing Updated:
December 2016

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

CLLI:
NDLDCOMARS1

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(303) 258

Notes:
Source: GSV

 

Denver

"Northglenn"
 

Listing Updated:
December 2016

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

CLLI:
NGLNCOMADS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(303) 252, 254-5, 280, 450-3, 457, 538, 920
(720) 627, 872, 929, 972, 977

Notes:
Source: GSV

 

Denver

"Smoky Hill"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCOSHDS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(303) 269, 400, 617, 627, 680, 690, 693, 699, 766
(720) 870, 876, 886

Notes:
Source: GSV

 

Denver

"Sullivan"
 

Listing Updated:
December 2016

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

CLLI:
DNVRCOSLDS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(303) 283, 306, 337-8, 368-9, 614, 636, 671, 695-6, 743, 745, 750-2, 755, 873
(720) 744, 747-8

Notes:
Source: GSV

 

Denver

"Table Mesa"
 

Listing Updated:
December 2016

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

CLLI:
TEMACOMADS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(303) 494, 497, 499, 543, 554
(720) 304

Notes:
Source: GSV

 

Denver

"Ward"
 

Listing Updated:
December 2016

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

CLLI:
WARDCOMARS1

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(303) 459

Notes:
Source: GSV

 

Denver

"Westminster"
 

Listing Updated:
December 2016

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

CLLI:
WMNSCOMADS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(303) 412, 426-30, 487, 650, 657
(720) 540, 542

Notes:
Source: GSV

 

Strasburg
 

Listing Updated:
November 2011

Operating Company:
TDS/Strasburg Telephone Company

CLLI:
STBGCOXCDS0

Switch Type:
Genband/Nortel DMS-10

Prefixes Served:
(303) 622

Notes:
Source: GSV

 

 


Copyright 2016 Telephone Central Office Building Pictures
Page last modified December 16, 2016
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