Dear Mr. Henderson,
Thank you for posting your request on History Hub!
The State Department has custody of passport applications dated after 1925. For information on how to request an application, please visit their web site at https://travel.state.gov/content/travel/en/passports/have-passport/passport-records.html. All requests for passport records issued after 1925 to the present should be mailed to the U.S. Department of State, Office of Law Enforcement Liaison, FOIA Officer, 44132 Mercure Circle, P.O. Box 1227, Sterling, VA 20166.
We hope this information is helpful.