Area Codes
| 712 | Iowa (Estherville, Council Bluffs, Sioux City, Sheldon, Denison and western Iowa) | More information at: Area Code 712 Phone Number Blocks
| 712 | Iowa (Estherville, Council Bluffs, Sioux City, Sheldon, Denison and western Iowa) | More information at: Area Code 712 Phone Number Blocks