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Area Codes 203 & 475
Telephone Central Office Building Pictures

The following are representative examples of telephone central office buildings in Area Codes 203 and 475 (Connecticut).

Click on the pictures below for a larger version.


Ansonia-Derby

"Derby"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
DRBYCT00DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 732, 734-6, 751, 922, 924

Notes:
Also serves Huntington. Source: GSV

 

Branford

"Main"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
315, 481, 483, 488
 

Switch Type:
Nokia Siemens DE5

Prefixes Served:
(203) 315, 481, 483, 488

Notes:
Source: GSV

 

Branford

"North Branford"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
NBFRCT00RS0

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 484

Notes:
Source: GSV

 

Bridgeport

"01 (John Street)"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
BRPTCT01DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 224, 330-9, 362, 366-8, 382, 384, 394, 534, 576, 579, 581, 615, 696

Notes:
Source: GSV

 

Bridgeport

"03 (Main Street)"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
BRPTCT03DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 275, 279, 342, 365, 371-4, 396, 416

Notes:
Source: GSV

 

Bridgeport

"Stratford"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
SRFRCT00DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 375, 377-8, 380-1, 383, 385-6, 502

Notes:
Source: GSV

 

Cheshire

Photo 2
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
CHSHCT01DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 250, 271-2, 699

Notes:
Source: GSV

 

Danbury

"Main"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
DNBRCT00DS1

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 205, 207, 730-1, 739, 743-4, 748-9, 778, 790-2, 794, 796-8, 825, 830, 837

Notes:
Source: GSV

 

Danbury

"Brookfield"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
BRFDCT00DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 740, 775

Notes:
Source: GSV

 

Danbury

"New Fairfield"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
NWFLCT00RS1

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 312, 746

Notes:
Source: GSV

 

Darien
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
DARNCT00RS1
 

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 655-6, 662

Notes:
Source: GSV

 

Fairfield
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
FRFDCT00DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 254-6, 259, 319

Notes:
Source: GSV

 

Georgetown
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
GRTWCT00RS0

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 544

Notes:
Source: GSV

 

Greenwich
 

Listing Updated:
July 2017

Operating Company:
Verizon/Bell Atlantic/New York Telephone

CLLI:
GNWCCTGNDS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 422, 522, 618, 622, 625, 629, 661, 769, 861-3, 869

Notes:
One of two ratecenters served by a non (historically) SNET entity. Also serves the Byram ratecenter. Source: GSV

 

Guilford
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
GUFDCT00DS0

Switch Type:
Nokia Siemens EWSD DE5

Prefixes Served:
(203) 453, 458

Notes:
Source: GSV

 

Huntington
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
HNTNCT00DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 225, 402, 925-6, 929, 944

Notes:
Source: GSV

 

Madison

"Boston Post"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
MDSNCT01RS0

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 245, 318

Notes:
Source: GSV

 

Madison

"Durham"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
MDSNCT02RS0

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 421, 457
(860) 663

Notes:
Also serves parts of Guilford and Killingworth. Source: GSV

 

Meriden

"Main (Butler)"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
MRDNCT00DS1

Switch Type:
Nokia Siemens EWSD DE5

Prefixes Served:
(203) 235, 237-8, 317, 379, 630, 634, 639, 686, 694

Notes:
Source: GSV

 

??

Meriden

"Deerfield"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
MRDNCT04RS0

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 420

Notes:
Source: GSV

 

Milford
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
MLFRCT00DS0

Switch Type:
Nokia Siemens EWSD DE5

Prefixes Served:
(203) 301, 783, 874, 876-8, 882

Notes:
Source: GSV

 

Naugatuck
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
NGTCCT00DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 720, 723, 729

Notes:
Source: GSV

 

New Canaan
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
NWCNCT00DS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(203) 801, 966, 972

Notes:
Source: GSV

 

New Haven

"Main"
 

Listing Updated:
May 2013

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
NWHNCT03DS0

NWHNCT03DS3

Switch Type:
DS0: Alcatel/Lucent 5ESS
DS3: Alcatel/Lucent 5ESS

Prefixes Served:
DS0: (203) 492, 495, 497-9, 503, 603, 619, 688, 691, 737, 764-5, 771, 781, 812, 821, 928, 946

DS3: (203) 401, 432, 436, 562, 624, 752, 772-3, 776-7, 782, 784-7, 789, 865, 867

Notes:
Source: GSV

 

New Haven

"Bethany"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
BTHNCT00RS0

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 393

Notes:
Source: GSV

 

New Haven

"East Haven"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
EHVNCT00DS0

Switch Type:
Nokia Siemens EWSD DE5

Prefixes Served:
(203) 466-9

Notes:
Source: GSV

 

New Haven

"Hamden"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
HMDNCT00DS0

Switch Type:
Nokia Siemens EWSD DE5

Prefixes Served:
(203) 230, 248, 281, 287-8, 407, 582

Notes:
Source: GSV

 

New Haven

"North Haven"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
NHVNCT00RS0

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 234, 239, 654, 985

Notes:
Source: GSV

 

New Haven

"Orange (Remote)"

Photo 2
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
ORNGCT00RS0

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 795, 799, 891

Notes:
Photo 2 is "Orange Host" which is the host for this switch but does not have any prefixes of its own. Source: GSV

 

New Haven

"West Haven"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
WSHNCT00DS0

Switch Type:
Nokia Siemens EWSD DE5

Prefixes Served:
(203) 479, 931-4, 937

Notes:
Source: GSV

 

New Haven

"Westville"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
WSTVCT00DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 387, 389, 392, 397

Notes:
Source: GSV

 

Newtown
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
NWTWCT00DS0

Switch Type:
Nokia Siemens EWSD DE5

Prefixes Served:
(203) 270, 364, 426

Notes:
Source: GSV

 

Norwalk

"02 (Washington Street)"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
NRWLCT02DS2

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 299, 831, 838, 851-5, 857, 866, 899, 945, 963, 991

Notes:
Source: GSV

 

Norwalk

"03 (Main Street)"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
NRWLCT03DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 229, 750, 840, 845-7, 849

Notes:
Source: GSV

 

Old Greenwich
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
OGNWCT00RS1

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 637, 698

Notes:
Source: GSV

 

Redding
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
RDNGCT00RS0

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 938

Notes:
Source: GSV

 

Ridgefield
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
RDFDCT00RS1

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 431, 438, 894

Notes:
Source: GSV

 

Seymour
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
SYMRCT00RS0

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 881, 888

Notes:
Source: GSV

 

Stamford

"01 (Main)"
 

Listing Updated:
May 2013

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
SMFRCT01DS1
SMFRCT01DS2

Switch Type:
DS1: Alcatel/Lucent 5ESS
DS2: Alcatel/Lucent 5ESS

Prefixes Served:
DS1: (203) 323, 325, 327-8, 352-3, 359, 406, 967, 973, 975, 978

DS2: (203) 251, 282, 316, 324, 326, 348, 351, 356-8, 363, 425, 462, 539, 541, 585, 602, 674, 708, 719, 728, 890, 921, 940, 961, 964-5, 969, 977

Notes:
Source: GSV

 

Stamford

"02 (High Ridge)"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
SMFRCT02DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 321-2, 329, 461, 595, 609, 614, 703, 962, 968

Notes:
Source: GSV

 

Trumbull
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
TMBLCT00DS0

Switch Type:
Nokia Siemens EWSD DE5

Prefixes Served:
(203) 261, 268, 445, 452, 459

Notes:
Source: GSV

 

Wallingford
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
WLFRCT00DS0

Switch Type:
Nokia Siemens EWSD DE5

Prefixes Served:
(203) 265, 269, 284, 294, 677, 679, 741, 949

Notes:
Source: GSV

 

Waterbury

"Main"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
WTRBCT00DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 236, 346, 419, 465, 573-5, 578, 591, 596-7, 709, 753-7, 759

Notes:
Source: GSV

 

Waterbury

"Middlebury"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
MDLBCT00RS0

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 577, 598, 695

Notes:
Source: GSV

 

Waterbury

"Prospect"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
PRSPCT00RS0

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 527, 758

Notes:
Source: GSV

 

Westport
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
WSPTCT00DS0

Switch Type:
Alcatel/Lucent 5ESS

Prefixes Served:
(203) 221-2, 226-7, 291, 341, 454

Notes:
Source: GSV

 

Wilton
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
WLTOCT00DS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(203) 563, 761-2, 834

Notes:
Source: GSV

 

Wolcott
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
WLCTCT00RS1

Switch Type:
Alcatel/Lucent 5ESS Remote

Prefixes Served:
(203) 879

Notes:
Source: GSV

 

Woodbury

"Southbury"
 

Listing Updated:
July 2017

Operating Company:
Frontier/at&t/SBC/Southern New England Telephone

CLLI:
SOBYCT00DS0

Switch Type:
Genband/Nortel DMS-100

Prefixes Served:
(203) 262-4, 266-7, 486

Notes:
Source: GSV

 

 


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Page last modified July 13, 2017
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