There are 39 US Post Offices in Hancock County serving a total of 57,024 residents equating to 1,462 residents per post office. It's estimated that approximately 91,017 packages are handled across the 39 county post offices annually. Hancock County is a county located in the U.S. state of Maine. As of the 2010 census, the population was 54,418. Its county seat is Ellsworth. The county was incorporated on June 25, 1789 and named for John Hancock, the first governor of the Commonwealth of Massachusetts. The Commissioners are Antonio Blasi, Steven Joy, Percy Brown.