Area code 821 vs 864
821 and 864 are overlay codes: they cover the same ground in South Carolina, and a number in one is a local call to the other. 864 is the original, in service since 1995. 821 was added in 2024 because the first was filling up – that is what an overlay is for. Today 821 has 42 of 786 blocks assigned (5.3%) and 864 has 784 of 786 (99.7%), so a new number in the area now almost always comes from 821. In the 33 days to 30 October 2026, 864 drew 575 FTC complaints against 8 for 821 – 179th and 407th of 422 ranked codes. Older codes are spoofed more because they look more established. Neither code is better or safer than the other. They are the same geography, the same carriers and the same dialing rules; the difference is only how long each has existed and how full it is.
Side by side
| 821 | 864 | |
|---|---|---|
| In service since | 2024 | 1995 |
| Region | South Carolina | South Carolina |
| Blocks assigned | 42 of 786 (5.3%) | 784 of 786 (99.7%) |
| Largest block holder | AT&T 57.1% | AT&T 32.5% |
| Complaints, 28 Sep – 30 Oct 2026 | 8 (#407) | 575 (#179) |
| Rate centers | 16 | 66 |
Block share is allocation by the numbering administrator, not subscribers. Complaint counts cover 28 Sep – 30 Oct 2026 and measure how often each code is spoofed on caller ID.
Frequently asked
What is the difference between area codes 821 and 864?
None geographically – they overlay the same area, so the difference is age and how many numbers are left.
Do I need to dial the area code between 821 and 864?
Yes. Overlay areas use ten-digit dialing for local calls, including between the two codes. Seven digits reaches a recording.
Will a new number be 821 or 864?
Whichever has blocks left – currently 821, at 5.3% allocated against 99.7% for the other. Carriers draw from the code with free blocks, which is why the newer code spreads over time.
Is 821 or 864 more likely to be a spam call?
On the complaint data, 864 appears more often. But spoofing drives those counts, so this is about which code gets imitated, not which numbers are real.
Sources
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
Each code on its own: 821 · 864. All codes in South Carolina: South Carolina area codes.