Inside the one-square-mile city, the mail is not delivered to houses. Residents pick up letters and parcels at the post office downtown, Neighboring unincorporated residential districts that are also called Carmel do have home delivery.
When the city decided to introduce street addresses, city staff said addresses would not by themselves bring home delivery, and residents would keep their box numbers. The Postal Service told the council that the local post office would not close. A post office has served the village since 1902, the year the Carmel Development Company filed its map.
Mail is addressed to the box number rather than to the house.