Unlike most cities, in Toronto the transition from their traditional dialing pattern (in Toronto, the first two letters of an exchange name followed by a four-digit number designating the individual line) to the standard United States pattern (two letters and five digits, the first of which was considered a part of the exchange) was stretched over most of a decade. In January 1951, some exchanges were converted to the standard pattern. However, until March 1958, Toronto constituted a mixed-pattern city, and both 2L-4N and 2L-5N numbers were the rule, depending on the exchange.
The tables that this page leads to give the exchanges in use in Toronto after the 1950s, when the format of telephone numbers changed from two letters and four digits (two-letter exchange names) to two letters and five digits (two- letter-one-digit exchange names). For the exchanges prior to the 1950s, please see the section of this website devoted to early dial Toronto exchanges.
This section is organized in the same way as is each geographical section of this site: by exchange. There are three tables, which can be described as alphabetical, numeric, and alphabetical/numeric:
|Alphabetic table of exchange names|
|Numeric table of exchange names|
|Alphabetic/Numeric table of exchange names|
|Main Toronto page|
|Chronological periods of the Toronto data:|
|Pre-dial period||Early dial period||Late dial period|
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Last modified September 12, 2015.