The Telecommunications HIstory Group physical archives holds Bell System and Regional Bell Operating Company directories from 15 states from the midwest and western United States. These directories date back to 1890. Our collection does not have a complete collection for every area and every year.

If you are interested in our research services or if you’d like to visit and utilize the telecommunications history archives in Denver, Colorado, please fill out our online request form.

Bell System Directories – States Available: