Area code 451 – North Carolina, not yet in service
451 is a North Carolina area code that has been assigned but is not in use yet: it has no in-service date set yet. NANPA records it as an overlay on 828, so it will supply new numbers across the same area rather than replacing any existing ones. Once live, local calls across the 451/828 codes will need all ten digits.
- State
- North Carolina
- In service from
- Date not set
- Time zone
- Eastern
- Overlay on
- 828
What happens when 451 goes live
- Existing 828 numbers do not change. An overlay only supplies new numbers.
- Local calls across 451/828 will need all ten digits.
- New lines in the area may be issued either code, depending on what the carrier has available.
- NANPA publishes the permissive and mandatory dialing dates in a planning letter before the start date.
No in-service date has been published yet. This page is updated when NANPA posts the planning letter.
Timeline
- Announced 451 assigned by NANPA as an overlay on 828. In-service date not yet published.
More about 451
Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.
Frequently asked about 451
What state is area code 451?
North Carolina. NANPA has assigned it as an overlay on 828, but it is not in service yet.
When does area code 451 start?
No in-service date has been published. NANPA lists the code as assigned with relief planning in progress; the date appears in a NANPA planning letter before it starts.
Will my 828 number change?
No. 451 is an overlay, which means it adds a new code for new numbers in the same area. Existing 828 numbers keep their code.
Can I get a 451 number now?
No. No number blocks have been assigned in this code yet.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – NPA relief planning letters, retrieved Nov 1, 2026
NANPA dialing note for this code: “10D”. Reviewed by the data desk. Spotted an error? Request a correction.