In the 1920s the first telephone exchanges in Toronto were converted to dial. Although at that time most exchanges remained manual, that can be considered the beginning of the "early dial" period in Toronto, in which telephone numbers were set up to accommodate dialing the first two letters of an exchange name followed by a four-digit number designating the individual line. Over the succeeding years, as exchanges were converted to dial, this pattern continued until 1958.
In January 1951, some exchanges were converted to what was becoming the standard United States number dialing pattern, two letters and five digits (the first of which was considered a part of the exchange). However, for a period of several years, Toronto constituted a mixed-pattern city, and both 2L-4N and 2L-5N numbers were the rule, depending on the exchange. (For the exchanges with 2L-5N patterns in use, see the pages covering the late dial period.
This section is organized in the same way as is each geographical section of this site: by exchange. There are two tables, which can be described as alphabetical and numeric:
|Alphabetic table of exchange names|
|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.