There are 12 US Post Offices in Clark County serving a total of 112,053 residents equating to 9,338 residents per post office. It's estimated that approximately 178,849 packages are handled across the 12 county post offices annually. Clark County is a county located in the U.S. state of Indiana, located directly across the Ohio River from Louisville, Kentucky. At the 2010 Census, the population was 110,232. The county seat is Jeffersonville. Clark County is part of the Louisville/Jefferson County, KY\u2013IN Metropolitan Statistical Area."