Publications

Planning Letters 2023

These Informational Letters (IL) or Planning Letters (PL) may be downloaded from this web site. These files require the use of the Adobe Acrobat Reader.

Number Subject Date
PL-623 NPA 621 to Overlay NPA 281/346/713/832 (Texas) December 6, 2023
PL-622 NPA 879 to Overlay NPA 709 (Newfoundland & Labrador, Canada) - supersedes PL-557 September 15, 2023
PL-621 NPA 837 to Overlay NPA 530 (California) August 8, 2023
PL-620 NPA 564 to Overlay NPA 206 (Washington) August 3, 2023
PL-619 NPA 729 to Overlay NPA 423 (Tennessee) July 24, 2023
PL-618 NPA 679 to Overlay NPA 313 (Michigan) July 13, 2023
PL-617 NPA 457 to Overlay NPA 318 (Louisiana) June 23, 2023
PL-616 NPA 924 to Overlay NPA 507 (Minnesota) June 12, 2023
PL-615 Assignment of NPA 532 for Non-Geographic Services May 25, 2023
PL-614 NPA 738 to Overlay NPA 213/323 (California) May 16, 2023
PL-613 NPA 942 to Overlay NPA 416/437/647 (Toronto, Ontario) May 11, 2023
PL-612 NPA 257 to Overlay NPA 236/250/604/672/778 (British Columbia) May 11, 2023
PL-611 Assignment of NPA 633 for Non-Geographic Services (Canada) April 10, 2023
PL-610 NPA 436 to Overlay NPA 440 (Ohio) February 16, 2023
PL-609 710 Numbering Plan Area (NPA) for the U.S. Government January 26, 2023
PL-608 NPA 686 to Overlay NPA 804 (Virginia) January 9, 2023

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