Telephone Numbers

Understanding Telephone Numbers

State Map by Area Code

NANPA (North American Numbering Plan Administration)

Telephone Number Relief
314 Area Code: The Missouri Commission worked with the North American Numbering Plan Administrator (NANPA) and the telecommunications industry on implementation of an overlay plan and the introduction of a new area code in the 314 area code region in Missouri. The new area code is 557. All existing 314 area code customers retained their current area code in the overlay area and their telephone numbers did not change. August 12, 2022 was the earliest date telephone numbers with a 557 area code were activated and used within the 314 area code. The 557 area code co-exists everywhere in this region with the 314 area code. All local calls within this region must be dialed using ten digits rather than seven digits.  Case No. TO-2022-0010

816 Area Code: The Missouri Commission worked with the North American Numbering Plan Administrator (NANPA) and the telecommunications industry on implementation of an overlay plan and the introduction of a new area code in the 816 area code region in Missouri. The new area code is 975. All existing 816 area code customers retained their current area code in the overlay area and their telephone numbers did not change. October 13, 2023 was the earliest date telephone numbers with a 975 area code were activated and used within the 816 area code. The 975 area code co-exists everywhere in this region with the 816 area code. All local calls within this region must be dialed using ten digits rather than seven digits.  Case No. TO-2022-0010

573 Area Code: The Missouri Commission worked with the North American Numbering Plan Administrator (NANPA) and the telecommunications industry on implementation of an overlay plan and the introduction of a new area code in the 573 area code region in Missouri. The new area code is 235. All existing 573 area code customers retained their current area code in the overlay area and their telephone numbers did not change. March 24, 2024 was the earliest date telephone numbers with a 235 area code were activated and used within the 573 area code. The 235 area code co-exists everywhere in this region with the 573 area code. All local calls within this region must be dialed using ten digits rather than seven digits.  Case No. TO-2022-0250             

Elimination of 7-digit Local Dialing for 988 National Suicide Prevention Lifeline
On July 16, 2020, the FCC established 988 as the nationwide, easy-to-remember 3-digit dialing code for Americans in crisis to connect with suicide prevention and mental health crisis counselors. Report and Order     

In order to accomodate the 988 code 7-digit local dialing was eliminated in the following Missouri area codes: 314, 417, 660 and 816. July 16, 2022 the "988" 3-digit dialing code was launched and routes calls to the National Suicide Prevention Lifeline.

FCC Press Release
Missouri Case No. TO-2021-0155