LincMad Telephone Area Codes & Splits

Map of the Original Area Code Assignments in 1947
LincMad map of 1947 area codes, map1947.gif, 37,201 bytes
Looking for a current map of U.S. & Canada area codes? Go to LincMad’s 2014 Area Code & Time Zone Map!


This map shows the original area code boundaries, established in 1947. Customer direct-dialed long distance did not yet exist, but area codes facilitated operator-dialed calls. Notice that in all cases where a state or province has a single area code, the middle digit is always ‘0’, while area codes in states and provinces with multiple area codes all have a ‘1’ as the middle digit. Note that area codes were not yet assigned for areas such as Alaska, Hawaii, northern Canada, and the Caribbean. In 1947, Newfoundland and Labrador had not yet joined Canada; if you have information regarding their status in the original area code plan (were they part of 902?), please e-mail me [link fixed 2014-01-09].

A number of these original area codes split not long after they were established, beginning in 1948 with the creation of area code 219 in northern Indiana. Other area code boundaries were significantly realigned in areas like Minnesota, California, and Massachusetts. The separation of N0X area codes for single-code states and N1X area codes for multi-code states, however, did not survive very long, with the assignment of area code 813 in southern Florida in 1953 marking the first of many that violated the rule. However, it remained true until 1995 that the middle digit of any area code was always a ‘0’ or a ‘1’, at which point area codes with a middle digit of ‘2’ through ‘8’ began being assigned. (Area codes with middle digit ‘9’ are reserved for expansion to longer telephone numbers, some time in the 21st Century.)

The original area codes are available in a text-based table. (Note: Your browser must support HTML tables.)

Return to LincMad’s Telephone Area Code page

©1997 Linc Madison, a.k.a. LincMad Consulting, all rights reserved. URL: <> Boundaries shown are approximate. Comments to contact a~t lincmad d~o~t com

Last updated 2014-01-29; map last updated 1997-04-06. received over a million visits from 1997 until the counter broke.

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