Postmasters can be found by searching on the United States Postal Service website on the postmaster finder page. Postmasters can be searched for by city, state or post office.
In 1986 the postmaster finder database was created for use as the Postal Service's national record of postmasters. Information before 1986 is researched and added on a case-by-case basis upon request. When searching for postmasters using the United States Postal Service website, it will list all the postmasters over the years from that specific post office. If a postmaster cannot be found using the postmaster finder, then the national archives may have that information upon request. Historians have also written books about the Postal Service and some include the names and dates of postmasters.