PSC (Public Service Commission) of Missouri State of United States declared in 2000 that a new area code will be added as an overlay to the existing area code 314. However the idea was postponed and it is still not implemented because the existing area codes are working fine.
State of Missouri is one of the West North Central States. Other West North Central States are:
- Iowa
- Kansas
- Minnesota
- Nebraska
- North Dakota
- South Dakota
- Area Code 314 (Created in 1947)
- Area Code 417 (Created in 1950)
- Area Code 573 (Created in 1996)
- Area Code 636 (Created in 1996)
- Area Code 660 (Created in 1997)
- Area Code 816 (Created in 1947)
- Area Codes which have been reserved for the State of Missouri but they are not in service are:
- Area Code 557 (will be added as an overlay to area code 314)
- Area Code 975 (overlay to area code 816, postponed)
- West: Code 660, Code 417
- North: Code 660, Code 217
- East: Code 636, Code 618, Code 270, Code 731
- South: Code 417, Code 870