In the 1920s, the first telephone exchanges in Seattle were converted to dial. Although at that time most exchanges remained manual, that can be considered the beginning of the "early dial" period in Seattle, 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 March 16, 1958.
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|
|Seattle metropolitan area:|
|Main page of Seattle metropolitan area data|
|Chronological periods of Seattle metropolitan area data:|
|Pre-dial period||Early dial period||Late dial period|
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Last modified September 13, 2015.