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Area Codes > 301 > Central Office Codes

Exchange Rate Center State Operating Company
301-504 WSHNGTNZN3 MD VERIZON MARYLAND, INC.
301-505 WSHNGTNZN6 MD VERIZON MARYLAND, INC.
301-506 WSNG236Z13 MD ARCH WIRELESS HOLDINGS, INC.
301-507 WSNG236Z13 MD VERIZON MARYLAND, INC.
301-508 MYERSVILLE MD DOBSON CELLULAR SYSTEMS, INC.
301-509 WSHNGTNZN3 MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
301-510 WSNG236Z13 MD ARCH WIRELESS HOLDINGS, INC.
301-511 MD
301-512 WSHNGTNZN3 MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
301-513 WSNG236Z13 MD VERIZON MARYLAND, INC.
301-514 FREDERICK MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
301-515 GAITHERSBG MD VERIZON MARYLAND, INC.
301-516 WSHNGTNZN5 MD VERIZON MARYLAND, INC.
301-517 WSNGTNZN10 MD VERIZON MARYLAND, INC.
301-518 WSHNGTNZN3 MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
301-519 GAITHERSBG MD VERIZON MARYLAND, INC.
301-520 WSHNGTNZN3 MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
301-521 WSHNGTNZN6 MD VERIZON MARYLAND, INC.
301-522 WSNGTNZN11 MD VERIZON MARYLAND, INC.
301-523 WSHNGTNZN3 MD SPRINT SPECTRUM L.P.
301-524 FREDERICK MD SPRINT SPECTRUM L.P.
301-525 GAITHERSBG MD QUANTUM TELECOMMUNICATIONS, INC. - MD
301-526 WSHNGTNZN3 MD NEW CINGULAR WIRELESS PCS, LLC - DC
301-527 GAITHERSBG MD VERIZON MARYLAND, INC.
301-528 GAITHERSBG MD VERIZON MARYLAND, INC.
301-529 WSNGTNZN10 MD NEW CINGULAR WIRELESS PCS, LLC - DC
301-530 WSHNGTNZN2 MD VERIZON MARYLAND, INC.
301-531 WSHNGTNZN4 MD STARPOWER COMMUNICATIONS, LLC - MD
301-532 WSHNGTNZN4 MD VERIZON MARYLAND, INC.
301-533 OAKLAND MD VERIZON MARYLAND, INC.
301-534 INDIANHEAD MD YMAX COMMUNICATIONS CORP. - MD
301-535 WALDORF MD NEW CINGULAR WIRELESS PCS, LLC - DC
301-536 LEONARDTN MD NEXTEL COMMUNICATIONS, INC.
301-537 WSHNGTNZN3 MD SPRINT SPECTRUM L.P.
301-538 WSHNGTNZN2 MD NEW CINGULAR WIRELESS PCS, LLC - DC
301-539 LA PLATA MD TELEPORT COMMUNICATIONS GROUP, INC. - DC
301-540 GAITHERSBG MD VERIZON MARYLAND, INC.
301-541 WSHNGTNZN5 MD TELEPORT COMMUNICATIONS GROUP, INC. - DC
301-542 WALDORF MD TELEPORT COMMUNICATIONS GROUP, INC. - DC
301-543 LAUREL236 MD TELEPORT COMMUNICATIONS GROUP, INC. - DC
301-544 WSNGTNZN10 MD VERIZON MARYLAND, INC.
301-545 WSNGTNZN10 MD VERIZON MARYLAND, INC.
301-546 CUMBERLAND MD ARCH WIRELESS HOLDINGS, INC.
301-547 WSHNGTNZN2 MD TELEPORT COMMUNICATIONS GROUP, INC. - DC
301-548 WSNGTNZN10 MD VERIZON MARYLAND, INC.
301-549 ASHTON236 MD VERIZON MARYLAND, INC.
301-550 MD
301-551 WSHNGTNZN3 MD BALTIMORE-WASHINGTON TELEPHONE BWT
301-552 WSNG236Z13 MD VERIZON MARYLAND, INC.
301-553 WALDORF MD ARCH WIRELESS HOLDINGS, INC.
301-554 WSHNGTNZN2 MD ARCH WIRELESS HOLDINGS, INC.
301-555 WSHNGTNZN4 MD VERIZON MARYLAND, INC.
301-556 GAITHERSBG MD TELEPORT COMMUNICATIONS GROUP, INC. - DC
301-557 MECHANCSVL MD ARCH WIRELESS HOLDINGS, INC.
301-558 WSNG236Z13 MD ARCH WIRELESS HOLDINGS, INC.
301-559 WSHNGTNZN4 MD VERIZON MARYLAND, INC.
301-560 WSHNGTNZN4 MD PAETEC COMMUNICATIONS, INC. - MD
301-561 WSHNGTNZN3 MD BALTIMORE-WASHINGTON TELEPHONE BWT
301-562 WSHNGTNZN3 MD VERIZON MARYLAND, INC.
301-563 WSHNGTNZN3 MD VERIZON MARYLAND, INC.
301-564 WSHNGTNZN2 MD VERIZON MARYLAND, INC.
301-565 WSHNGTNZN3 MD VERIZON MARYLAND, INC.
301-566 WSNG236Z13 MD VERIZON MARYLAND, INC.
301-567 WSHNGTNZN6 MD VERIZON MARYLAND, INC.
301-568 WSHNGTNZN5 MD VERIZON MARYLAND, INC.
301-569 GAITHERSBG MD GLOBAL NAPS SOUTH, INC. - MD
301-570 ASHTON236 MD VERIZON MARYLAND, INC.
301-571 WSHNGTNZN2 MD VERIZON MARYLAND, INC.
301-572 WSHNGTNZN3 MD VERIZON MARYLAND, INC.
301-573 HAGERSTOWN MD NEXTEL COMMUNICATIONS, INC.
301-574 WSNG236Z15 MD VERIZON MARYLAND, INC.
301-575 LAUREL236 MD US LEC OF VIRGINIA, LLC - DC
301-576 WSHNGTNZN3 MD PAETEC COMMUNICATIONS, INC. - MD
301-577 WSHNGTNZN4 MD VERIZON MARYLAND, INC.
301-578 WSHNGTNZN3 MD VERIZON MARYLAND, INC.
301-579 BRANDYWINE MD VERIZON MARYLAND, INC.
301-580 WSHNGTNZN3 MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
301-581 WSHNGTNZN2 MD VERIZON MARYLAND, INC.
301-582 HAGERSTOWN MD VERIZON MARYLAND, INC.
301-583 WSHNGTNZN4 MD VERIZON MARYLAND, INC.
301-584 WSNGTNZN12 MD BALTIMORE-WASHINGTON TELEPHONE BWT
301-585 WSHNGTNZN3 MD VERIZON MARYLAND, INC.
301-586 WSHNGTNZN3 MD VERIZON MARYLAND, INC.
301-587 WSHNGTNZN3 MD VERIZON MARYLAND, INC.
301-588 WSHNGTNZN3 MD VERIZON MARYLAND, INC.
301-589 WSHNGTNZN3 MD VERIZON MARYLAND, INC.
301-590 WSNGTNZN10 MD VERIZON MARYLAND, INC.
301-591 GAITHERSBG MD PAETEC COMMUNICATIONS, INC. - MD
301-592 WSHNGTNZN3 MD VERIZON MARYLAND, INC.
301-593 WSHNGTNZN3 MD VERIZON MARYLAND, INC.
301-594 WSHNGTNZN2 MD VERIZON MARYLAND, INC.
301-595 WSNG236Z13 MD VERIZON MARYLAND, INC.
301-596 LAUREL238 MD VERIZON MARYLAND, INC.
301-597 HANCOCK MD NEW FRONTIERS TELECOMMUNICATIONS, INC.
301-598 WSNGTNZN12 MD VERIZON MARYLAND, INC.
301-599 WSHNGTNZN5 MD VERIZON MARYLAND, INC.
301-600 FREDERICK MD VERIZON MARYLAND, INC.
301-601 WSNGTNZN10 MD VERIZON MARYLAND, INC.
301-602 WSHNGTNZN3 MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
301-603 WSNGTNZN11 MD VERIZON MARYLAND, INC.