Dear Ms. Kunkel,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Records of Appointments of Postmasters, 1832-1931 and Records of Appointment of Postmasters and the Establishment of Post Offices, 7/1/1931 - 10/31/1971 in the Records of the Post Office Department (Record Group 28) that includes the files Postmaster Appointments for Jefferson County, Virginia and Postmaster Appointments for Jefferson County, West Virginia which have been digitized and are available online through the Catalog.
These records also are available through Ancestry through their website as data collection U.S., Appointments of U. S. Postmasters, 1832-1971. Some libraries provide free access to Ancestry to their patrons. The copies on Ancestry are name searchable.
Additionally, we searched the USPS Historian’s Postmaster Finder and located a listing of postmasters of the Shepherdstown Post Office, Jefferson County, West Virginia. To bring up this listing, use the Postmasters by City search feature.
We hope this information is helpful. Best of luck with your research!