There are 1 US Post Offices in Estill County serving a total of 13,061 residents equating to 13,061 residents per post office. It's estimated that approximately 20,847 packages are handled across the 1 county post offices annually. Estill County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 14,672. Its county seat is Irvine The county was formed in 1808 and named for Captain James Estill, a Kentucky militia officer who was killed in the Battle of Little Mountain during the American Revolutionary War. It is a prohibition or dry county. In 2008, Estill County welcomed the Estill County Bicentennial that included a yearlong celebration of themed months showcasing 200 years of history, importance and the viability of Estill County and its Twin Cities of Irvine and Ravenna. Both cities sit along the Kentucky River. Ravenna is home to CSX Transportation and the historic Fitchburg & Cottage Furnaces and conducted the Ravenna Railroad Festival in August 2008. Irvine is home to the manufacturing headquarters of Carhartt, Inc. and annually hosts the Mountain Mushroom Festival over last weekend of April."