In the 1920s, the first telephone exchanges in Pittsburgh were converted to dial. Although at that time most exchanges remained manual, that can be considered the beginning of the "early dial" period in Pittsburgh, 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 August 13, 1949.
While, based on the size of the city, it had been thought that the 2L-4N pattern would be adequate for Pittsburgh, it was getting to be obvious by the 1940s that the Pittsburgh telephone system was growing faster than other cities such as Atlanta or New Orleans, which were able to remain on a 2L-4N basis for a number of years beyond. Consequently, on August 13, 1949, Pittsburgh numbers 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). Pittsburgh thus was among the earliest of the cities that converted from 2L-4N to 2L-5N.
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|
|Pittsburgh metropolitan area:|
|Metropolitan Pittsburgh main page|
|Main page of Pittsburgh city data||Main page of Pittsburgh suburban data|
|Chronological periods of Pittsburgh city data:||Chronological periods of the Pittsburgh suburban data:|
|Pre-dial period||Early dial period||Late dial period||Pre-dial period||Early dial period||Late dial period|
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Last modified September 19, 2015.