Telecommunications History Group Archives

Our physical archives in Denver, Colorado, contains an extensive collection of photographs, historical documents, telephone directories, and memorabilia.

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The THG Archives is open to visits by outside researchers on Wednesdays from 8 am to noon, by appointment only.
To schedule an appointment please call us at 303-296-1221 or email us at telcomhist@aol.com.

By scheduling a visit, you agree to the following policies:

  • No food or drinks are allowed in the research area.
  • No pens may be used while performing research. We will provide you with a pencil if needed.
  • To protect the documents and photographs, you may not wear gloves or use hand sanitizer while handling archive materials. Please wash your hands frequently using soap and water instead.
  • A fee of $20 per four-hour session (plus any copying charges) will apply. This should be paid at the time of your visit.

    • About the archives

    At Telecommunications History Group, we’re quite proud of our archives collection. Our physical, telecommunications history archive is located in Denver, Colorado in a secure building near the old Mountain States Telephone and Telegraph Company Headquarters. The archive collection includes more than 80,000 photos and slides, numerous books, memorabilia, and publications related to telecommunications technology, business, culture, people, and architecture. We have a volunteer archivist on our team in Denver, and we take great pride in maintaining our professional research archive.

    We provide research services to individuals and companies for a wide variety of purposes, including legal research, genealogy, business, and more. Individual researchers may also utilize our archives by appointment. If you are interested in scheduling an appointment, please utilize the form below. To make a donation to our archives, Click Here

    What You Will Find...

    The Telecommunications History Group - Telecommunications History Archives - PhotographsPhotographs – Our collection features nearly 70,000 black and white prints and negatives, dated between 1876-1992, as well as more than 10,000 color slides and prints. Learn More…
    The Telecommunications History Group - Telecommunications History Archives - Telephone DirectoriesTelephone Directories – We have Bell System and Regional Bell Operating Company directories from 1890 to 2001, representing Arizona, Colorado, Idaho, Iowa, Minnesota, Montana, Nebraska, New Mexico, North Dakota, Oregon, South Dakota, Utah, Washington, Wyoming and 60 years of Texas books. Learn More…
    The Telecommunications History Group - Telecommunications History Archives - Historical DocumentsHistoric Documents – We have records from over 500 telephone companies west of the Mississippi (circa 1878-1998). We have a unique collection of telephone company stock certificates, and scrapbooks and memoirs compiled by telephone company employees and their families. Learn More…
    The Telecommunications History Group - Telecommunications History Archives - Current EventsMemorabilia – An important and often overlooked category of history is known as ephemera, physical items not meant to be saved or permanent, but that are saved and collected for various reasons, often sentimental. Often these items are the very things that fill in the gaps of a story or a history. Learn More…
    The Telecommunications History Group - Telecommunications History Archives - TimelineTimeline – Here you will find a timeline of important telecommunications events, as well as our Top 10 list of both past and future. Learn More…