There are 5 US Post Offices in Powell County serving a total of 6,836 residents equating to 1,367 residents per post office. It's estimated that approximately 10,911 packages are handled across the 5 county post offices annually. Powell County is a county located in the U.S. state of Montana. As of the 2010 census, the population was 7,027. Its county seat is Deer Lodge."