Subject: 301/410 detail chart --- * for archives * From: David Leibold Date: Sat, 27 Jul 91 11:06:19 EDT Organization: Brave New World, Delray Beach, FL, USA [Here's the detailed listing of how the 301/410 area code split in Maryland is going to work out; this is a listing of prefixes, which area code they have after the split, LATAs and other commentary. Please put in the archives, with perhaps a mention of its existence.] ; ; NPA 301/410 Maryland 25 July 1991 ; ; The following list is sorted in order of the prefix. At present ; all prefixes are under area code 301. However, after November 1991, ; those indicated with 410 under the NPA column will be active in ; the new area code 410. After November 1992, they will no longer ; be area code 301 prefixes but in 410 area. Special prefixes that ; will be assigned in both area codes are listed twice, for the ; convenience of those using utilities like grep. ; ;NPA NXX Place LATA Comment 301 203 Oxon Hill [W] 410 205 Baltimore [B] 301 206 Berwyn [W] 410 208 Berlin [S] 301 209 Hyattsville [W] 301 210 Laurel [W] 410 213 Ocean City [S] 301 217 Rockville [W] 301 220 Berwyn [W] 410 221 Cambridge [S] 410 222 Severn 2 [B] 301 223 Williamsport [H] 410 224 Annapolis [B] 410 225 Baltimore [B] 410 226 Oxford [S] 301 227 Bethesda [W] 410 228 Cambridge [S] 301 229 Bethesda [W] 301 230 Kensington [W] 301 231 Kensington [W] 410 232 Baltimore [B] 410 233 Baltimore [B] 410 234 Baltimore [B] 410 235 Baltimore [B] 301 236 Layhill [W] 410 237 Baltimore [B] 301 238 Clinton [W] 410 239 Reisterstown [B] Hampstead 301 240 Rockville [W] 301 241 Highfield [H] 410 242 Arbutus [B] 410 243 Baltimore [B] 410 244 Baltimore [B] 301 245 Bittinger [H] 301 246 Nanjemoy [W] 410 247 Arbutus [B] 301 248 Oxon Hill [W] 301 249 Bowie-Glenn Dale [W] 410 250 Ocean City [S] 301 251 Rockville [W] 410 252 Towson [B] 301 253 Damascus [W] 410 254 Baltimore [B] 410 255 Armiger-Gibson Isl. [B] 410 256 Parkville [B] 410 257 North Beach [B] 301 258 Rockville [W] 301 259 Tompkinsville [W] 410 260 Severna Park 1 [B] Annapolis {4} 301 261 Bowie-Glenn Dale [W] 301 262 Bowie-Glenn Dale [W] 410 263 Annapolis [B] 301 264 Mount Savage [H] 410 265 Woodlawn [B] 410 266 Annapolis [B] 410 267 Annapolis [B] 410 268 Annapolis [B] 410 269 Severna Park 1 [B] {4} 301 270 Silver Spring [W] 301 271 Thurmont [H] 410 272 Aberdeen [B] 410 273 Aberdeen [B] 301 274 Hughesville [W] 410 275 Cecilton [S] 410 276 Baltimore [B] 301 277 Hyattsville [W] 410 278 Aberdeen [B] 301 279 Rockville [W] 410 280 Annapolis [B] 410 281 Woodlawn [B] 410 282 Dundalk [B] 301 283 Oxon Hill [W] Accokeek 410 284 Dundalk [B] 410 285 Dundalk [B] 301 286 Berwyn [W] 410 287 North East [B] 410 288 Dundalk [B] 410 289 Ocean City [S] 410 290 Columbia [B] 410 291 Baltimore [B] 301 292 Oxon Hill [W] Ft Washington 301 293 Myersville [H] 301 294 Rockville [W] 301 295 Bethesda [W] 410 296 Towson [B] 301 297 Clinton [W] 410 298 Woodlawn [B] 301 299 Rockville [W] 410 303 Columbia [B] 301 306 Hyattsville [W] 410 307 Towson [B] 301 309 Rockville [W] 410 312 Columbia [B] 410 313 Ellicott City [B] 301 314 Hyattsville [W] 410 316 Cockeysville [B] Hunt Valley 301 317 Laurel [W] 410 319 Baltimore [B] 301 320 Bethesda [W] 410 321 Towson [B] 301 322 Hyattsville [W] 410 323 Baltimore [B] 410 325 Baltimore [B] 410 326 Solomons [B] 410 327 Baltimore [B] 410 328 Baltimore [B] 410 329 Cockeysville [B] 301 330 Gaithersburg [W] 301 331 Hagerstown [H] 410 332 Baltimore [B] 410 333 Baltimore [B] 301 334 Oakland [H] 410 335 Chase [B] 301 336 Capitol Heights [W] Seat Pleasant 410 337 Towson [B] 410 338 Baltimore [B] 410 339 Towson [B] 301 340 Rockville [W] 301 341 Hyattsville [W] 410 342 Baltimore [B] 410 343 Sparks-Glencoe [B] 301 344 Berwyn [W] 301 345 Berwyn [W] 410 346 Silver Run [B] 410 347 Baltimore [B] 410 348 Still Pond [S] 301 349 Poolesville [W] 301 350 Capitol Heights [W] 410 351 Baltimore [B] 410 352 Bishopville [S] 301 353 Rockville [W] 410 354 Baltimore [B] 410 355 Baltimore [B] 410 356 Pikesville [B] 410 357 Parkton [B] 410 358 Baltimore [B] 301 359 Westernport [H] 410 360 Armiger-Gibson Isl. [B] 410 361 Baltimore [B] 410 362 Baltimore [B] 410 363 Pikesville [B] 410 364 Hillsboro [S] 301 365 Bethesda [W] 410 366 Baltimore [B] 410 367 Baltimore [B] 410 368 Baltimore [B] 301 369 Berwyn [W] Laurel 410 370 Catonsville [B] 301 371 Braddock Heights-Middletown [H] 301 372 Clinton [W] Brandywine 301 373 Leonardtown [W] Hollywood 410 374 Hampstead [B] 301 375 Indian Head [W] Bryans Road 410 376 Vienna [S] 410 377 Towson [B] 410 378 Port Deposit [B] 410 379 Elkridge [B] 301 380 Bethesda [W] 410 381 Columbia [B] 410 382 Baltimore [B] 410 383 Baltimore [B] 301 384 Layhill [W] 410 385 Baltimore [B] 301 386 Hyattsville [W] 301 387 Oakland [H] 410 388 Sparrows Point [B] 410 389 Baltimore [B] 301 390 Bowie-Glenn Dale [W] 410 391 Essex [B] 410 392 Elkton [B] 410 393 Baltimore [B] 301 394 Silver Spring [W] 301 395 Oldtown [H] 410 396 Baltimore [B] 410 397 Wingate [S] 410 398 Elkton [B] 301 401 Frederick [H] 301 402 Bethesda [W] 301 403 Hyattsville [W] 410 404 Baltimore [B] 301 405 Hyattsville [W] 301 409 Berwyn [W] 301 414 Damascus [W] 301 416 Myersville [H] 301 417 Rockville [W] 301 419 Berwyn [W] 301 420 Capitol Heights [W] Suitland 301 421 Ashton [W] 301 422 Hyattsville [W] 301 423 Capitol Heights [W] Marlow Heights 301 424 Rockville [W] 410 425 Smith Island [S] 410 426 Baltimore [B] 301 427 Silver Spring [W] 301 428 Rockville [W] 410 429 Worthington [B] 410 430 Baltimore [B] 301 431 Silver Spring [W] 301 432 Keedysville [H] 410 433 Baltimore [B] 301 434 Silver Spring [W] 410 435 Baltimore [B] 301 436 Hyattsville [W] 410 437 Armiger-Gibson Isl. [B] 410 438 Sudlersville [S] 301 439 Silver Spring [W] 410 440 Catonsville [B] 301 441 Berwyn [W] 410 442 Ellicott City [B] 301 443 Kensington [W] 410 444 Baltimore [B] 301 445 Silver Spring [W] 301 447 Emmitsburg [H] 410 448 Baltimore [B] 301 449 Capitol Heights [W] Camp Springs 410 450 Baltimore [B] 410 451 Severn 2 [B] 410 452 Cardiff [B] 301 453 Kitzmiller [H] 301 454 Hyattsville [W] 410 455 Catonsville [B] 410 456 Baltimore [B] 410 457 Darlington [B] 410 458 Baltimore [B] 301 459 Hyattsville [W] 301 460 Kensington [W] 410 461 Ellicott City [B] 410 462 Baltimore [B] 301 463 Lonaconing [H] 301 464 Bowie-Glenn Dale [W] 410 465 Ellicott City [B] 410 466 Baltimore [B] 410 467 Baltimore [B] 301 468 Kensington [W] 301 469 Bethesda [W] 301 470 Bowie-Glenn Dale [W] Laurel 410 471 Elkridge [B] 410 472 Sparks-Glencoe [B] 301 473 Frederick [H] 301 474 Berwyn [W] 301 475 Leonardtown [W] 410 476 Trappe [S] 410 477 Sparrows Point [B] 301 478 Flintstone [H] 410 479 Denton [S] 301 480 Bethesda [W] 410 481 Baltimore [B] 410 482 Greensboro [S] 410 483 Baltimore [B] 410 484 Pikesville [B] 410 485 Baltimore [B] 410 486 Pikesville [B] 301 487 Myersville [H] 410 488 Baltimore [B] 410 489 Glenwood [B] 301 490 Laurel [W] 301 491 Hagerstown [H] 301 492 Bethesda [W] 301 493 Bethesda [W] 410 494 Towson [B] 301 495 Silver Spring [W] 301 496 Bethesda [W] 301 497 Laurel [W] 301 498 Laurel [W] 301 499 Capitol Heights [W] 301 502 Silver Spring [W] # cellular 301 505 Oxon Hill [W] 301 507 Berwyn [W] 301 509 Silver Spring [W] # cellular 301 510 Berwyn [W] 301 513 Berwyn [W] 410 516 Baltimore [B] 301 518 Silver Spring [W] # cellular 301 520 Silver Spring [W] # cellular 410 521 Randallstown [B] 410 522 Baltimore [B] 410 523 Baltimore [B] 410 524 Ocean City [S] 410 525 Baltimore [B] 410 526 Reisterstown [B] 410 527 Cockeysville [B] Hunt Valley 410 528 Baltimore [B] 410 529 Parkville [B] 301 530 Bethesda [W] 410 531 Columbia [B] 410 532 Baltimore [B] 410 533 Annapolis [B] 410 534 Baltimore [B] 410 535 Prince Frederick [B] 410 536 Arbutus [B] 410 537 Baltimore [B] C&P Tel. business ofc 410 538 Fork [B] 410 539 Baltimore [B] 301 540 Gaithersburg [W] 410 541 Severna Park 2 [B] {4} 410 542 Baltimore [B] 410 543 Salisbury [S] 410 544 Severna Park 1 [B] {4} 410 546 Salisbury [S] 410 547 Baltimore [B] 410 548 Salisbury [S] 410 549 Sykesville [B] 410 550 Baltimore [B] 410 551 Severn 1 [B] 301 552 Berwyn [W] 410 553 Glen Burnie [B] 410 554 Baltimore [B] 301 555 (Directory Assistance) 410 555 (Directory Assistance) 410 556 Church Hill [S] 410 557 Fork [B] North East 410 558 Baltimore [B] 301 559 Hyattsville [W] 410 560 Towson [B] Lutherville-Timonium 410 561 Towson [B] 410 562 Annapolis [B] 410 563 Baltimore [B] 301 564 Bethesda [W] 301 565 Silver Spring [W] 410 566 Baltimore [B] 301 567 Oxon Hill [W] 301 568 Capitol Heights [W] 410 569 Edgewood [B] (formerly Severn?) 301 570 Ashton [W] 301 571 Bethesda [W] 301 572 Silver Spring [W] 410 573 Annapolis [B] 410 574 Essex [B] 410 575 Fork [B] North East 410 576 Baltimore [B] 301 577 Hyattsville [W] 410 578 Baltimore [B] 301 579 Brandywine [W] Baden 301 580 Silver Spring [W] 410 581 Pikesville [B] Owings Mills 301 582 Hagerstown [H] 410 583 Towson [B] 410 584 Cockeysville [B] Hunt Valley 301 585 Silver Spring [W] 410 586 Prince Frederick [B] 301 587 Silver Spring [W] 301 588 Silver Spring [W] 301 589 Silver Spring [W] 301 590 Rockville [W] 410 591 Baltimore [B] 410 592 Fork [B] 301 593 Silver Spring [W] 410 594 Woodlawn [B] 301 595 Berwyn [W] 301 596 Laurel 2 [W] 410 597 Woodlawn [B] 301 598 Layhill [W] 301 599 Capitol Heights [W] 301 601 Rockville [W] 410 602 Pikesville [B] 301 604 Laurel [W] 410 605 Baltimore [B] 301 606 Frederick [H] 301 607 Damascus [W] 301 608 Silver Spring [W] 410 612 Edgewood [B] 410 613 Baltimore [B] 301 618 Hyattsville [W] 301 620 Frederick [H] 301 621 Bowie-Glenn Dale [W] Laurel 301 622 Silver Spring [W] 410 623 Marion [S] 410 624 Baltimore [B] 410 625 Baltimore [B] 410 626 Annapolis [B] 301 627 Marlboro [W] 410 628 Cockeysville [B] 301 629 Bowie-Glenn Dale [W] 301 630 Oxon Hill [W] 410 631 Baltimore [B] 410 632 Snow Hill [S] 410 633 Baltimore [B] 410 634 Ridgely [S] 410 635 New Windsor [B] 410 636 Brooklyn Park-Linthicum [B] 410 637 Baltimore [B] 410 638 Bel Air [B] 410 639 Rock Hall [S] 301 640 Rockville [W] 410 641 Berlin [S] 410 642 Perryville [B] 410 643 Stevensville [S] 410 644 Baltimore [B] 301 645 Waldorf [W] 410 646 Baltimore [B] 410 647 Severna Park 1 [B] {4} 410 648 Galena [S] 301 649 Kensington [W] 301 650 Silver Spring [W] 410 651 Princess Anne [S] 301 652 Bethesda [W] 410 653 Pikesville [B] 301 654 Bethesda [W] 410 655 Randallstown [B] 301 656 Bethesda [W] 301 657 Bethesda [W] 410 658 Rising Sun [B] independent exchange 410 659 Baltimore [B] 410 661 Parkville [B] 301 662 Frederick [H] 301 663 Frederick [H] 410 664 Baltimore [B] 410 665 Parkville [B] 410 666 Cockeysville [B] 410 667 Cockeysville [B] 410 668 Parkville [B] 410 669 Baltimore [B] 301 670 Rockville [W] 410 671 Edgewood [B] 410 672 Odenton [B] 410 673 Preston [S] 410 674 Odenton [B] 410 675 Baltimore [B] 410 676 Edgewood [B] 410 677 Severn 1 [B] 301 678 Hancock [H] 410 679 Fork [B] North East 301 680 Silver Spring [W] 301 681 Silver Spring [W] 410 682 Essex [B] 410 683 Cockeysville [B] 410 684 Glen Burnie [B] Friendship 410 685 Baltimore [B] 410 686 Essex [B] 410 687 Essex [B] 410 688 Odenton [B] Ft Meade {1} 301 689 Frostburg [H] 410 691 Glen Burnie [B] Friendship 410 692 Jarrettsville [B] 410 693 Annapolis [B] 301 694 Frederick [H] 301 695 Frederick [H] 301 696 Frederick [H] 301 697 Cumberland [H] 301 698 Frederick [H] 301 699 Hyattsville [W] 301 702 Capitol Heights [W] 301 705 Waldorf [W] 301 707 Cumberland [H] 410 712 Elkridge [B] 301 713 Silver Spring [W] 301 714 Hagerstown [H] 301 718 Bethesda [W] 410 719 Catonsville [B] 410 720 Ellicott City [B] 410 721 Crofton [B] 301 722 Cumberland [H] 410 723 Ocean City [S] 301 724 Cumberland [H] 301 725 Laurel [W] 410 726 Salisbury [S] 410 727 Baltimore [B] 410 728 Baltimore [B] 301 729 Cumberland [H] 410 730 Columbia [B] 301 731 Hyattsville [W] 410 732 Baltimore [B] 301 733 Hagerstown [H] 410 734 Churchville [B] 301 735 Capitol Heights [W] Suitland 301 736 Capitol Heights [W] Suitland 301 737 Lexington Park-Great Mills [W] 301 738 Rockville [W] 301 739 Hagerstown [H] 410 740 Columbia [B] 410 741 West River [B] 410 742 Salisbury [S] 301 743 Indian Head [W] 410 744 Catonsville [B] 410 745 St Michaels [S] 301 746 Friendsville [H] 410 747 Catonsville [B] 410 748 Ellicott City [B] 410 749 Salisbury [S] 410 750 Ellicott City [B] 410 751 Westminster [B] Taneytown 410 752 Baltimore [B] 301 753 Indian Head [W] Oxon Hill 410 754 Federalsburg [S] 410 755 Warwick [S] 410 756 Taneytown [B] 410 757 Annapolis [B] 410 758 Centreville [S] 301 759 Cumberland [H] 410 760 Glen Burnie [B] 410 761 Glen Burnie [B] 301 762 Rockville [W] 410 764 Baltimore [B] 410 765 Glen Burnie [B] Friendship 410 766 Glen Burnie [B] 410 768 Glen Burnie [B] 301 769 Leonardtown [W] Milestown 301 770 Kensington [W] 410 771 Cockeysville [B] Hunt Valley 301 772 Hyattsville [W] 301 773 Hyattsville [W] 301 774 Ashton [W] 410 775 Union Bridge [B] 301 776 Laurel [W] 301 777 Cumberland [H] 410 778 Chestertown [S] 301 779 Hyattsville [W] 410 780 Essex [B] 410 781 Ellicott City [B] 301 782 Brandywine [W] 410 783 Baltimore [B] 410 784 Deal Island [S] 410 785 Cockeysville [B] Hunt Valley 301 786 McCoole [H] 410 787 Glen Burnie [B] 410 788 Catonsville [B] 410 789 Brooklyn Park-Linthicum [B] 301 790 Hagerstown [H] 301 791 Hagerstown [H] 410 792 Waterloo [B] Laurel 410 793 Severna Park 2 [B] Annapolis {4} 301 794 Bowie-Glenn Dale [W] 410 795 Sykesville [B] 410 796 Elkridge [B] 301 797 Hagerstown [H] 410 798 West River [B] 410 799 Waterloo [B] 301 805 Bowie-Glenn Dale [W] 410 806 Towson [B] 301 807 Silver Spring [W] 301 808 Capitol Heights [W] 410 813 Waterloo [B] 301 816 Kensington [W] 410 820 Easton [S] 410 821 Towson [B] 410 822 Easton [S] 410 823 Towson [B] 301 824 Smithsburg [H] 410 825 Towson [B] 301 826 (Accident) [H] {2} likely de-tolled 410 827 Queenstown [S] 410 828 Towson [B] 301 829 Mount Airy [H] 410 830 Towson [B] 301 831 Damascus [W] Mt Airy-Newmarket svc 410 832 Towson [B] 410 833 Reisterstown [B] 301 834 Brunswick [H] 410 835 Willards [S] 410 836 Bel Air [B] 410 837 Baltimore [B] 410 838 Bel Air [B] 301 839 Oxon Hill [W] 301 840 Rockville [W] 410 841 Severna Park 1 [B] Annapolis {4} 301 842 Clear Spring [H] 301 843 Waldorf [W] some sources dispute 410 844 Baltimore [B] time of day service {5} 301 845 Walkersville [H] 301 846 Frederick [H] 410 847 Wingate [S] 410 848 Westminster [B] 410 849 Sherwood Forest [B] 410 850 Glen Burnie [B] Friendship 301 851 Hyattsville [W] 301 852 Hyattsville [W] 301 853 Hyattsville [W] 301 854 Ashton 2 [W] Highland 301 855 Marlboro [W] 301 856 Clinton [W] 410 857 Westminster [B] 301 858 Bowie-Glenn Dale [W] 410 859 Glen Burnie [B] Friendship 410 860 Salisbury [S] 410 861 Westminster [B] 301 862 Lexington Park-Great Mills [W] 301 863 Lexington Park-Great Mills [W] 301 864 Hyattsville [W] 301 865 New Market [H] 410 866 Essex [B] 410 867 West River [B] 301 868 Clinton [W] 301 869 Gaithersburg [W] 301 870 La Plata [W] 301 871 Kensington [W] 301 872 Ridge [W] 410 873 Nanticoke [S] 301 874 Buckeystown [H] 410 875 Sykesville [B] Westminster 410 876 Reisterstown [B] Westminster 410 877 Fallston [B] 410 878 Baltimore [B] Ft Ritchie {3} 410 879 Fork [B] North East 410 880 Waterloo [B] Laurel 301 881 Kensington [W] 410 882 Parkville [B] 410 883 Sharptown [S] 301 884 Mechanicsville [W] 410 885 Chesapeake City [S] 410 886 Tilghman [S] 410 887 Towson [B] 301 888 Clinton [W] Baden 410 889 Baltimore [B] 301 890 Layhill [W] 301 891 Silver Spring [W] 410 892 Glen Burnie [B] Friendship 410 893 Fork [B] 301 894 Oxon Hill [W] 301 895 Grantsville [H] 410 896 Delmar [S] 301 897 Bethesda [W] 301 898 Frederick [H] Walkersville 410 899 Capitol Heights [W] 301 905 Silver Spring [W] 410 906 Baltimore [B] 301 907 Bethesda [W] 301 913 Bethesda [W] 301 915 915 Service special toll services 410 915 915 Service special toll services 301 916 Gaithersburg [W] 301 918 Hyattsville [W] 301 919 Bethesda [W] 410 920 North East [B] 301 921 Rockville [W] 410 922 Randallstown [B] 410 923 Millersville [B] 301 924 Layhill [W] 301 925 Capitol Heights [W] Seat Pleasant 301 926 Gaithersburg [W] 301 927 Hyattsville [W] 410 928 Millington [S] 301 929 Kensington [W] 301 930 Silver Spring [W] 410 931 Parkville [B] 301 932 Waldorf [W] La Plata 301 933 Kensington [W] 301 934 La Plata [W] 301 935 Berwyn [W] 410 936 Weather Service - Baltimore [B] 301 937 Berwyn [W] 410 938 Towson [B] 410 939 Havre de Grace [B] 301 940 Hyattsville [W] 410 941 Jarrettsville [B] once listed Stewartstown 301 942 Kensington [W] 410 943 Hurlock [S] 410 944 Woodlawn [B] 410 945 Baltimore [B] 301 946 Kensington [W] 410 947 Baltimore [B] 301 948 Rockville [W] 301 949 Kensington [W] 301 950 (LD Carrier Access) for alternate long distance 410 950 (LD Carrier Access) for alternate long distance 301 951 Bethesda [W] 301 952 Marlboro [W] 301 953 Berwyn [W] Laurel 301 954 Baltimore [B] C&P repair/business 410 954 Baltimore [B] C&P repair/business 410 955 Baltimore [B] 410 956 Annapolis [B] 410 957 Pocomoke [S] 410 960 Baltimore [B] 301 961 Bethesda [W] 410 962 Baltimore [B] 301 963 Gaithersburg [W] 410 964 Columbia [B] 410 965 Woodlawn [B] 410 966 Woodlawn [B] 301 967 Capitol Heights [W] Suitland 410 968 Crisfield [S] 410 969 Severn 2 [B] 301 970 Bowie-Glenn Dale [W] 410 971 Catonsville [B] 301 972 Gaithersburg [W] 301 973 Bowie-Glenn Dale [W] 410 974 Severna Park 1 [B] Annapolis {4} 301 975 Rockville [W] 301 976 976 Service special toll services 410 976 976 Service special toll services 301 977 Gaithersburg [W] 410 978 Catonsville [B] 410 979 Catonsville [B] 301 980 Silver Spring [W] # cellular 301 981 Capitol Heights [W] Andrews AFB 301 982 Berwyn [W] 301 983 Rockville [W] 301 984 Kensington [W] 301 985 Bethesda [W] 301 986 Bethesda [W] 410 987 Severn 2 [B] 410 988 Ellicott City [B] 301 989 Layhill [W] 301 990 Gaithersburg [W] 410 991 Annapolis [B] 410 992 Columbia [B] 410 993 Glen Burnie [B] Friendship 301 994 Lexington Park-Great Mills [W] Valley Lee 410 995 Ellicott City [B] 410 996 Elkton [B] 410 997 Columbia [B] 410 998 Pikesville [B] Owings Mills 410 999 Baltimore [B] ; ; Codes for LATAs: ; [B] - Baltimore LATA ; [H] - Hagerstown LATA ; [S] - Salisbury LATA ; [W] - Washington DC LATA ; ; Comment Symbols and Notes: ; ; # - known cellular service ; ; - this Ashton prefix has additional local calling area (Ellicott ; City) and has been seen on phone bills as Clarksville ; - this Berwyn prefix has additional local calling area ; - this Laurel prefix has additional local calling area: ; Columbia service ; - Severn 1 has extra local calling access ; compared to Severn 2 ; ; {1} - one source claims Waterloo; other sources claim that this ; is a Berwyn exchange in Washington Metro; consensus seems ; that this will go to area 410, or it could be on an ; aliased exchange ; {2} - Accident exchange seems to have been absorbed into ; Friendsville 746 prefix according to recent information ; {3} - 878 prefix serves Ft Ritchie but sources seem to converge ; on calling it a Baltimore prefix. C&P help line claims ; this will remain a 301 area code prefix after the split. ; {4} - Severna Park 2 has extra local calling access compared ; to Severna Park 1 ; {5} - 844.1212 listed for time inquiries ; ; Other Notes: ; ; The C&P automated help line service provides information on where ; prefixes will split and other details of the 301/410 split; it can ; be reached by calling 1 800 477 4704 (apparently reachable throughout ; the U.S.) However, this help line may be missing a few prefixes (or ; has treated a few as special cases): for instance 303 Columbia and ; 481 Baltimore. Special prefixes like 555 or 976 are not covered by ; this service. ; ; The 301/410 split is done quite neatly along LATA lines. The ; Washington DC and Hagerstown LATAs will remain in 301. The ; Baltimore and Salisbury LATAs will become area code 410. ; ; Acknowledgements to various sources from telco information (phone books, ; etc) and carriers. Thanks also to Carl Moore (cmoore@BRL.MIL) for ; helping with uncertain and hard-to-determine prefixes. Scott R. Houck ; (with data from David Hogben) wrote a utility to determine places ; for Washington DC area exchanges; some of this data was useful for ; corroborating Maryland prefixes in the Washington DC Metro local area.