| 314 | Missouri (St. Louis, Florissant, Crestwood, Affton, and surrounding Missouri suburbs) More information at: Area Code 314 Phone Number Blocks |
| 417 | Missouri (Joplin, Springfield, West Plains, Lamar, Lebanon and southwestern Missouri) More information at: Area Code 417 Phone Number Blocks |
| 557 | Missouri Overlay of Area code 314 More information at: Area Code 557 Phone Number Blocks |
| 573 | Missouri (Columbia, Jefferson City, Hannibal, Cape Girardeau, Poplar Bluff, Farmington, Park Hills, Lake Ozark and eastern Missouri excluding St. Louis) More information at: Area Code 573 Phone Number Blocks |
| 636 | Missouri (St. Charles, Chesterfield, Union, De Soto, Troy and east central Missouri) More information at: Area Code 636 Phone Number Blocks |
| 660 | Missouri (Marshall, Sedalia, Macon, Trenton, Maryville, Bethany and north central Missouri) More information at: Area Code 660 Phone Number Blocks |
| 816 | Missouri (Kansas City, St Joseph, Independence, Harrisonville and west central Missouri) More information at: Area Code 816 Phone Number Blocks |
| 975 | Missouri This area code is scheduled to provide numbering relief to code 816 but no date has been assigned for this to go into effect. More information at: Area Code 975 Phone Number Blocks |
