The 812 area code is a telephone area code in the North American Numbering Plan (NANP) for the southern third of the state of Indiana. It covers cities such as Evansville, Bloomington, and Terre Haute. The area code has a single overlay (930) that serves the same area. The numbering plan area (NPA) includes Evansville and most of the Indiana side of the Louisville metropolitan area. The 812 area code is in service since January 1, 1947, and is the parent Numbering Plan Area in overlay complex 812/930. The current time zone for the 812 area code is either Eastern Time Zone or Central Time Zone, depending on where you are calling.

In summary, the 812 area code is located in southern Indiana and covers cities such as Evansville, Bloomington, and Terre Haute.