The original North American area codes were established by the American Telephone and Telegraph Company (AT&T) in 1947, after the demonstration of regional Operator Toll Dialing …

2022年10月7日 · 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 …

2024年5月7日 · The following chart shows the original 86 Numbering Plan Areas (NPAs, or area codes) assigned in 1947. You can also see the map at map1947.html. Note that in several …

2025年1月23日 · The original 86 area codes became over 400. The following chart shows the original 86 area codes, plus the regions that were added later, and the area codes now used …

To faciltiate the millions of phone users, the United States of America is divided into regions known as Area Codes, corresponding to particular geographic telephone dialing areas.

How were the original area codes distributed? In 1947, states and provinces that had a single area code we assigned three digit codes with 0 as the middle number, such as 203 for …

Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits. …

This is the list of original North American Numbering Plan area codes of 86 plan areas as defined by AT&T in 1947. In preparation for direct distance dialing, AT&T and the Bell System …

This is a list of North American telephone area codes in effect for the North American Numbering Plan (NANP). The area to which an area code is officially assigned is known as a Numbering …

2022年2月20日 · 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 …