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: Nokia/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 EWSD 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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: April 2020 Operating Company: Frontier/at&t/SBC/Southern New England Telephone CLLI: MRDNCT04RS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (203) 420 Notes: This used to be an AT&T call center, but it closed in 2019. 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: Nokia/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: Ribbon/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: Nokia/Alcatel/Lucent 5ESS DS3: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/Alcatel/Lucent 5ESS DS2: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Nokia/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: Ribbon/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: Nokia/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: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (203) 262-4, 266-7, 486 Notes: Source: GSV

Visit other Connecticut Area Codes: 203 860

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