There are 6 US Post Offices in Bullitt County serving a total of 58,224 residents equating to 9,704 residents per post office. It's estimated that approximately 92,932 packages are handled across the 6 county post offices annually. Bullitt County is a county in the U.S. state of Kentucky located in the far western Bluegrass region known as the Knobs. As of the 2010 census, the population was 74,319. The county seat is Shepherdsville. The county was founded in 1796. Located just south of the city of Louisville, Bullitt County is included in the Louisville/Jefferson County, KY-IN Metropolitan Statistical Area, commonly known as Kentuckiana. The western fifth of the county (40,000 acres (160 km2)) is part of the United States Army post of Fort Knox and is reserved for military training."