Post towns are designated locations in Japan that serve as postal delivery hubs. Each post town is assigned a unique postal code, which helps streamline mail sorting and delivery. These towns often have a post office that manages the distribution of mail and packages to surrounding areas. In addition to their postal functions, post towns can also be historical or cultural sites. Many post towns, such as those along the Nakasendo route, were important during the Edo period for travelers and merchants. Today, they often attract tourists interested in exploring their rich history and traditional architecture.