Major changes to U.S. local calling:
If you currently dial just 7 digits for a local call, that may be
changing soon. Details of
“The Big 10D”
(coming in 2021–2022): will you be changing
to 10‑digit local calls?
codes (toll-free, information services, etc.) in North America, updated
area codes, updated
Nueva numeración en
México en 2019 •
new numbering in Mexico in 2019
[español • English]
Những thay đổi lớn đối với số điện thoại tại
trong năm 2017 và 2018
Major changes to telephone numbers in
Vietnam in 2017 and 2018
Changements majeurs à la numérotation téléphonique
vietnamienne en 2017 et 2018
[vi=Tiếng Việt • en=English • fr=français]
other related sites
(Note: these sites are maintained by other people or companies.)
This site contains information about the
North American Numbering Plan,
the telephone numbering scheme that serves the United States, Canada,
and several other countries and territories in the region.
The NANP divides the participating countries into area codes, each of which
is a three-digit number. Within each area code, a telephone number is always
7 digits, except for special codes like the 911 emergency number.
In the late 1990s, the NANP added new area codes at a rate unprecedented in
its 50-year history, with demand fueled primarily by the outdated system of
allocating blocks of numbers to telephone companies.
More efficient allocation methods, coupled with consolidation in the
telecommunications industry, have slowed the flood of new area codes to
barely a trickle, from 45 in 1997 to only 3 in 2007.
Notably, the introduction of new area codes has shifted decisively from
traditional area code splits to overlays. As of mid-2013, there are no
area code splits pending or planned anywhere in the NANP!
This site contains information about the original area codes from 1947,
their evolution to the current state, and future developments, including
area code splits and area code overlays.
These pages are designed with limited graphics to speed loading times.
The tables of information require a browser that supports HTML tables.
Almost all browsers do, but text-based browsers (e.g., Lynx) may display
the information in a jumbled form. The maps are displayed as GIF or PNG
images, which can be displayed on any graphical browser.
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