There are 11 US Post Offices in Hardin County serving a total of 103,949 residents equating to 9,450 residents per post office. It's estimated that approximately 165,914 packages are handled across the 11 county post offices annually. Hardin County is a county located in the U.S. state of Kentucky. Its county seat is at Elizabethtown. The county was formed in 1792. Hardin County is part of the Elizabethtown-Fort Knox, KY Metropolitan Statistical Area, as well as the Louisville/Jefferson County\u2014Elizabethtown-Madison, KY-IN Combined Statistical Area. As of the 2010 census, the population was 105,543. One of the most famous US Presidents, Abraham Lincoln was born in Hardin County."