Seattle telephone exchanges
The history of the telephone exchange names in Seattle, as in most
significant United States cities, can be divided into three periods:
- The pre-dial period, when all
telephone calls were completed by manual action by operators (Not all the
exchanges in Seattle were changed to dial at this time, but as long as
any exchanges were dial, the requirements for dial exchanges
applied), and there were no constraints on exchange names other than that
there was no likelihood of confusion when a customer gave the name to the
- The early dial period, in which the Seattle 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, though in fact not all exchanges provided for dialing by the phones in those exchanges, and
- The late dial period, beginning on March 16, 1958, in which, instead of the first two letters of an exchange name alone, one dialed the first two letters and an "office numeral" (This was the terminology used in an early New York City directory, though it was not common terminology in this period), again followed by four digits designating the individual line.
Last modified September 12, 2015.