Area Code 301
Telephone Central Office Building Pictures

The following are representative examples of telephone central office buildings in Area Code 301 (with overlay Area Code 240) (western/southern MD).

Click on the pictures below for a larger version.

Ashton "Olney Oakdale"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: OLNYMDOKRP0 Switch Type: Remote Packet Switch (unknown type) Prefixes Served: (301) 260, 570, 774, 924 Notes: Originally a 5ESS, now a remote packet switch. Also servers parts of Washington Zone 12. Source: GSV
Bittinger	Listing Updated: August 2023 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: BTNRMDBRRS1 Switch Type: Ribbon/Genband/Nortel RSC Prefixes Served: (301) 245 Notes: Source: GSV
Brandywine "Main" Photo 2	Listing Updated: August 2019 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: BRNDMDBERS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 371, 782 Notes: Current photo: GSV. Photo 2: December 2010. Also serves Washington Zone 16 (301-371)
Brandywine "Baden"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: BADNMDBNRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 579, 888 Notes: Also serves parts of Washington Zone 16. Source: GSV
Brunswick	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: BRWKMDBRRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 834 Notes: Source: GSV
Buckeystown Photo 2	Listing Updated: August 2023 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: BCTWMDBTRS1 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (240) 699 (301) 874 Notes: Current photo: GSV. Photo 2: Telebeans (December 2005)
Clear Spring	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: CLSPMDCSRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 842 Notes: Source: GSV
Cumberland "Main"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: CMLDMDCMDS0 Switch Type: Ribbon/Genband/Nortel DMS-100/200 Prefixes Served: (301) 722-4, 759, 777, 784 (814) 767 Notes: Serves State Line, PA (814-767) through an agreement with CenturyLink. Used to serve a ratecenter in WV prior to the spin off of Verizon i WV to Frontier in 2010. Source: GSV
Cumberland "Cresaptown"	Listing Updated: July 2023 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: CSTWMDCRDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (240) 362 (301) 729 Notes: Source: GSV
Emmitsburg Photo 2	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: EMBGMDEMRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 447 Notes: Photo source: Telebeans. Current photo source: GSV
Flintstone	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: FLNTMDFSRS0 Switch Type: Ribbon/Genband/Nortel RSC Prefixes Served: (301) 478 Notes: Source: GSV
Frederick "Main"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: FRDRMDFRDS0 FRDRMDFRDS1 Switch Type: DS0: Nokia/Alcatel/Lucent 5ESS Host DS1: Nokia/Alcatel/Lucent 5ESS Prefixes Served: DS0: (301) 418 DS1: (240) 236, 315, 379, 529, 566, 586, 629 (301) 228, 360, 600, 607, 619-20, 624, 631, 644, 662-3, 668, 682, 694-6, 698, 815, 846 Notes: Serves a number of remotes. Source: GSV
Friendsville	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: FIVLMDFRRS0 Switch Type: Ribbon/Genband/Nortel RSC Prefixes Served: (301) 746 Notes: Source: GSV
Frostburg	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: FSBGMDFSDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (301) 687, 689 Notes: Source: GSV
Gaithersburg "Main"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: GTBGMDGBPS0 Switch Type: Avaya/Nortel Succession CS-1000 Prefixes Served: (240) 276, 386, 631-2, 683 (301) 212, 216, 240, 258, 330, 355, 417, 519, 527, 548. 590, 640, 670, 721, 740, 840, 869, 921, 926, 947-8, 956, 963, 975, 977-9,987, 990 Notes: Also serves parts of the "Washington Zone 10" ratecenter. This building is now entirely served by a packet switch (it used to contain a 5ESS). Source: GSV
Gaithersburg "Germantown"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: GMTWMDGNDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (240) 686 (301) 353, 428, 444, 515, 528, 540, 601, 903, 916, 972 Notes: Serves parts of Washington Zone 10. Source: GSV
Hagerstown Photo 2	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: HGTWMDHGDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (240) 313, 420, 527 (301) 393, 665, 714, 733, 739, 745, 766, 790-1, 797 Notes: Photo 2 source: Telebeans. Current photo source: GSV
Highfield Photo 2	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: HGFLMDHFRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 241 Notes: Photo 2 source: Telebeans. Current photo source: GSV
Indian Head "Main" Photo 2	Listing Updated: August 2022 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: INHDMDINRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 743-4 Notes: Current photo: GSV. Photo 2: Telebeans (January 2004)
Indian Head "Bryans Road"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: BRRDMDBRRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 283, 375 Notes: Serves parts of Washington Zone 6. Source: GSV
Keedysville	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: KDVLMDKVRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 432 Notes: Source: GSV
Kitzmiller	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: KTZMMDKMRS0 Switch Type: Ribbon/Genband/Nortel RSC Prefixes Served: (301) 453 Notes: Source: GSV
La Plata Photo 2	Listing Updated: November 2024 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: LPLTMDLADS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Host Prefixes Served: (301) 392, 609, 753, 922, 934 Notes: Current photo: GSV. Photo 2: August 2009. Also serves part of Waldorf and Oxon Hill (Washington Zone 6).
Laurel "Main"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: LARLMDLRDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (240) 228, 456, 568, 592 (301) 206, 317, 362, 369, 376, 460, 483, 490, 497-8, 549, 604, 617, 647, 725, 776, 886, 939, 953 (410) 264, 416, 619, 724, 792, 797, 880, 888 (443) 778 Notes: Source: GSV
Laurel "Muirkirk" Photo 2	Listing Updated: September 2022 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: MRKKMDMKDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (240) 264 (301) 210, 419, 425-6, 566, 716 (410) 606, 705, 722, 738, 791, 813, 815, 898 Notes: Current photo: GSV. Photo 2: Telebeans (December 2005). Serves parts of Laurel, Washington Zone 13, and Waterloo rate centers.
Leonardtown "Main" Photo 2	Listing Updated: June 2018 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: LNTWMDLTRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 475, 997 Notes: Current photo: GSV. Photo 2: March 2010
Leonardtown "Hollywood"	Listing Updated: December 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: HLWDMDHWRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 373 Notes: Source: GSV
Leonardtown "Milestown" Photo 2 | Photo 3	Listing Updated: March 2010 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: MLTWMDMLRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 769 Notes: Note that the pay phone has been removed and the cornerstone when the building was built (most likely when this area went dial)
Lexington Park/Great Mills "Lexington Park"	Listing Updated: March 2010 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: LXPKMDLXDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Host Prefixes Served: (240) 725, 895 (301)  737, 826, 862-3, 866 Notes: CO is in a rough neighborhood. Notice that is is behind  a fence.  It is next to a good sized city park.
Lexington Park/Great Mills "Valley Lee" Photo 2 | Photo 3 | Photo 4	Listing Updated: September 2019 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: VYLEMDVLRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 994 Notes: Current photo: GSV. Photos 2-4: March 2010. Located out in the middle of nowhere, next to a volunteer fire station. Note in Picture 4 the date the building was built (most likely when this area went dial).
Lonaconing	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: LNCNMDLNRS0 Switch Type: Ribbon/Genband/Nortel RSC Prefixes Served: (301) 463 Notes: Source: GSV
Mechanicsville Photo 2	Listing Updated: November 2015 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: MCHVMDMCRS1 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 290, 472, 884 Notes: Current photo: GSV. Photo 2: April 2010
Middletown "Braddock Heights"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: BRHGMDBHRS1 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 371, 473 Notes: Also serves parts of Frederick, Source: GSV
Mount Airy	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: MTARMDMARS1 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 829 Notes: Source: GSV
Oakland	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: OKLDMDOKDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (301) 334, 553 Notes: Source: GSV
Poolsville	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: PLVLMDPVRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 349, 407, 605 Notes: Serves parts of Gaithersburg. Source: GSV
Ridge Photo 2	Listing Updated: October 2019 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: RIDGMDRIRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 872 Notes: Current photo: GSV. Photo 2: March 2010
Smithsburg	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: SMBGMDSMRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (240) 818 (301) 416, 824 Notes: Source: GSV
Thurmont Photo 2	Listing Updated: August 2024 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: THRMMDTHRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 271 Notes: Current photo: GSV. Photo 2: Telebeans (December 2005)
Tompkinsville Photo 2	Listing Updated: August 2022 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: TMVLMDTKRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 259 Notes: Current photo: GSV. Photo 2: March 2010
Waldorf Photo 2	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: WDRFMDWDDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Host Prefixes Served: (301) 374, 396, 632, 638, 645, 705, 764, 818, 843, 870, 885, 893 Notes: Also serves parts of Washington Zone 6 rate center. Photo 2 source: Telebeans. Current photo source: GSV
Walkersville	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: WLVLMDWLDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 845, 898 Notes: Source: GSV
Washington Zone 2 "Bethesda Bradley"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: BTHSMDBDDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 299, 365, 469, 765, 767, 983 Notes: Serves parts of Washington Zone 10. Source: GSV
Washington Zone 2 "Bethesda Wildwood"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: BTHSMDWWDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (240) 694 (301) 214, 295, 319, 380, 493, 530, 564, 571, 581, 803, 896-7 Notes: Source: GSV
Washington Zone 2 "Bethesda Wood Acres"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: BTHSMDWADS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 227, 229, 243, 263, 320 Notes: Source: GSV
Washington Zone 2 "Chevy Chase Bethesda"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: CHCHMDBEDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (240) 497 (301) 215, 280, 347, 492, 652, 654, 656-7, 664, 718, 771, 907, 913, 941, 951, 961, 986   Notes: Source: GSV
Washington Zone 3 "Hyattsville Chillum"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: HYVLMDCMDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 270, 559, 853, 891 Notes: Source: GSV
Washington Zone 3 "Hyattsville Riggs Road"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: HYVLMDRIDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 408, 422, 431, 434, 439, 445, 701, 923, 935 Notes: Serves parts of Washington Zones 4 & 13. Source: GSV
Washington Zone 3 "Silver Spring" Photo 2	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: SLSPMDSSDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS-2000 Prefixes Served: (240) 662 (301) 285, 427, 495, 562-3, 565, 578, 585, 587-9, 608, 626, 650, 819, 930 Notes: Photo 2 source: Telebeans. Current photo source: GSV.
Washington Zone 3 "Silver Spring Northwood"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: SLSPMDNWDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 592-3, 649, 681, 754, 905 Notes: Serves parts of Washington Zone 11. Source: GSV
Washington Zone 4 "Hyattsville" Photo 2	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: HYVLMDHYDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (240) 582 (301) 209, 239, 277, 403, 436, 454, 532, 699, 779, 851-2, 864, 887, 927, 985 Notes: Photo 2 source: Telebeans. Current photo source: GSV
Washington Zone 4 "Landover"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: LDVRMDLODS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 226, 322, 341, 386, 583, 618, 636, 772-3, 883, 925 Notes: Serves parts of Washington Zone 5. Source: GSV
Washington Zone 4 "Lanham"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: LNHMMDLNDS0 Switch Type: Nokia/Siemens EWSD Prefixes Served: (301) 306, 429, 459, 552, 577, 731, 794, 918 Notes: Serves parts of Washington Zones 13 & 14. Source: GSV
Washington Zone 5 "Capitol Heights"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: CPHGMDCADS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 324, 333, 336, 350, 499, 808 Notes: Source: GSV
Washington Zone 5 "Suitland"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: STLDMDSLDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 420, 516, 568, 669, 735-6, 763, 817, 967 Notes: Source: GSV
Washington Zone 5 "Temple Hills"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: TMHLMDTHDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (240) 695 (301) 238, 316, 423, 505, 630, 702, 836, 894, 899 Notes: Source: GSV
Washington Zone 6 "Allentown"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: ALTWMDATRP0 Switch Type: Remote Packet Switch (unknown type) Prefixes Served: (301) 234, 248, 265, 297, 433, 449 Notes: Originally a 5ESS, now a remote packet switch. Source: GSV
Washington Zone 6 "Ft. Washington - Chapel Hill" Photo 2	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: FTWSMDCPRP0 Switch Type: Remote Packet Switch (unknown type) Prefixes Served: (301) 203, 292 Notes: Originally a 5ESS, now a remote packet switch. Current photo: GSV. Photo 2: Telebeans
Washington Zone 6 "Oxon Hill"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: OXHLMDOHDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 521, 567, 686, 749,839 Notes: Source: GSV
Washington Zone 10 "Rockville"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: RKVLMDRVDS1 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (240) 314, 328, 453, 567, 773, 777, 826 (301) 251, 279, 295, 309, 315, 340, 398, 424, 517, 544-5, 610, 738, 762, 838 Notes: Source: GSV
Washington Zone 11 "Rockville Montrose"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: RKVLMDMRDS0 RKVLMDMRRS1 Switch Type: DS0: Nokia/Alcatel/Lucent 5ESS DS1: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: DS0: (240) 221 DS0: (301) 230-1, 25, 382, 413, 468, 522, 770, 816, 881, 984, 998 DS1: (301) 443 Notes: Source: GSV
Washington Zone 11 "Silver Spring Norbeck"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: SLSPMDNBDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 438, 460, 598, 603, 871 Notes: Serves parts of Washington Zone 12. Source: GSV
Washington Zone 11 "Wheaton"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: WHTNMDWTDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (240) 292 (301) 929, 933, 946, 949, 962 Notes: Source: GSV
Washington Zone 12 "Fairland"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: FALDMDFLRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 282 Notes: Source: GSV
Washington Zone 12 "Silver Spring Colesville"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: SLSPMDCVDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 236, 384, 388, 421, 476, 622, 625, 680, 879, 940, 989 Notes: Serves parts of Washington Zone 3 and Ashton. Source: GSV
Washington Zone 13 "Beltsville"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: BTVLMDBVDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 394, 572, 586, 595. 796, 847, 890, 902, 931, 937 Notes: Serves part of Washington Zone 3. Source: GSV
Washington Zone 13 "College Park - Berwyn"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: CLPKMDBWDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (240) 624, 684 (301) 220, 286, 313, 344-5, 397, 441, 446, 474, 486, 488-9, 507, 513, 614-5, 901, 982, 993 Notes: Source: GSV
Washington Zone 14 "Bowie"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: BOWIMDBODS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 262, 352, 464, 805, 809, 860 Notes: Source: GSV
Washington Zone 14 "Upper Marlboro Church Rd."	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: UPMRMDCCDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 218, 249, 390, 430 Notes: Source: GSV
Washington Zone 15 "Marlboro" Photo 2	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: MRBOMDMBDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (301) 574, 627, 780, 952 (410) 741 Notes: Also serves parts of West River rate center. Photo 2 source: Telebeans. Current photo source: GSV
Washington Zone 16 "Clinton"	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: CLTNMDCLDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (240) 318 (301) 599, 856, 868, 877 Notes: Serves parts of Washington Zone 5. Source: GSV
Williamsport	Listing Updated: February 2021 Operating Company: Verizon/Bell Atlantic/C&P of Maryland CLLI: WLPTMDWPRS2 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (301) 223, 582 Notes: Serves parts of Hagerstown. Source: GSV

Visit other Maryland Area Codes: 301 410

Visit nearby regions: Delaware District of Columbia Pennsylvania Virginia West Virginia