There are 6 US Post Offices in Parke County serving a total of 16,067 residents equating to 2,678 residents per post office. It's estimated that approximately 25,645 packages are handled across the 6 county post offices annually. Parke County lies in the western part of the U.S. state of Indiana along the Wabash River. The county was formed in 1821 out of a portion of Vigo County. According to the 2010 census, the population was 17,339, an increase of 0.6% from 17,241 in 2000. The county seat is Rockville. It has a population density of about 39 inhabitants per square mile (15/km2). The county contains six incorporated towns and many unincorporated communities. It is divided into 13 townships which provide local services. Two U.S. Routes and five state highways pass through or into the county, along with one major railroad line. Parke County has 31 covered bridges and describes itself as the Covered Bridge Capital of the World. It is the site for the Parke County Covered Bridge Festival which has been held in October each year."