Seattle Telephone History

Here's some data I destroyed my wrists typing. But now it's online, and that's good. We need more history online.

Washington and Idaho Cutovers

Current as of the end of 1954. :)

2L-5N Cutover

What do you do when you need to change an entire city's phone number format over? You announce it, and then you DO it! Seattle added a seventh digit on 16-Mar-1958. Here's a list of the before-and-after C.O. codes.

Seattle Switching Districts

This is from a document written in 1966, with a general overview of the Seattle machine switching systems and their history.

Introduction.

By district name [not all are typed up yet!]: Adams — Atwater — Cherry — Duwamish — East — Emerson — Lakeview — Main — Melrose — Parkway — Sunset — West.

Seattle Crossbar Tandem.