The Mahan Family Tree on

The extensive Mahan Family Tree, compiled over many years by Dr. Harry James (Jim) Mahan, is on the website. With permission from Jim’s wife, Jan, I have accepted the honors of preserving Jim’s work, making it more accessible to other family members and friends and doing minor updates as new information becomes available to me.

Currently, there are almost 1300 people represented in the Mahan Family Tree, which includes members of the related Campbell, Harvey, Miller and other families, as well. Here’s a small screenshot of the top of the family tree that starts with Thomas Mahan. who was born in Ireland.

Thomas MAHAN was born in Dromore, Cork, Ireland. He married Ann Jane Patterson in Dromore, Cork, Ireland. They had six children in 18 years. He died on August 15, 1848, in Guernsey, Ohio, and was buried there.

Request guest access to view the Mahan Family Tree

If you are a family member, related family member or family friend and are interested in viewing the full family tree, please fill out the contact form on the Get in Touch page to request a guest access link.

To use the link I will generate for you, you will need to create a free account on If you already have a free or paid account, you will be able to use the link with your existing account. With guest access, you will be able to peruse the entire family tree with no worries about accidentally changing or deleting anything.

Once you have accessed the Mahan Family Tree on, you will be able to search to find yourself in the tree, pan and zoom, select other individuals to view more information about them, expand and collapse various branches of the tree and generally trace up down and sideways through many generations of family members.

Below is a short video that will help you use your guest access link to find and navigate the Mahan Family Tree on

Provide information for the Mahan Family Tree

If you have information you would like to suggest to be added to the Mahan Family Tree, please fill out the contact form o nthe Get in Touch page to communicate the information you have. Here are a few types of information that can be added to the family tree:

  • Additions such as births, marriages, etc.
  • Updates such as deaths, divorces, etc.
  • Corrections, if needed
  • Background information, such as stories, certificates, other documents, etc.
  • Photographs

Please include details if possible, such as full (first middle last) names, event dates, etc. Also, if you see any potential errors in the existing family tree, please send those suggestions along, as well.

Just say “Hello!”

Please feel free to use the contact form on the Get in Touch page to simply say hello. As more family members contact me, I may also be able to help you get in touch with other family members, as well. In any case, I look forward to hearing from you!