The following chart shows the original 86 area codes,
plus the regions that were added later,
and the area codes now used in those regions.
Many of the new area codes were created by simple
geographic splits, but in several cases the existing boundary
was realigned and/or a new area code was created
from portions of two old area codes.
However, area code splits have entirely given way to overlays:
the last split in the United States was in
,
and the last split in Canada was in
.
Table notation
Notation change:
Overlay codes are prefixed with an @ symbol.
Unconfirmed listings are prefixed with a ? question mark.
Area codes marked with an asterisk✻ are comprised of parts of
two or more original area codes.
Area codes in (parentheses) are planned overlays for
to about .
A “primary” area code is one that at some point was the
only area code for its geographic territory.
The listing of area codes is now ordered as follows:
primary area codes entirely within the original
area code boundaries
primary area codes partly within
overlay area codes entirely within
overlay area codes partly within
upcoming overlays entirely within
upcoming overlays partly within
unconfirmed listings
Updated
.
Original
Location
Area codes as of [@ overlay, ✻ portion; () overlay planned for
-]