Area code 318 vs 457
318 and 457 are overlay codes: they cover the same ground in Louisiana, and a number in one is a local call to the other. 318 is the original, in service since 1957. 457 was added in 2025 because the first was filling up – that is what an overlay is for. Today 318 has 765 of 786 blocks assigned (97.3%) and 457 has 0 of 786 (0.0%), so a new number in the area now almost always comes from 457. 318 appears in the complaint data with 956 complaints in the window; 457 does not appear at all, which is what you would expect of a code that is barely used so far. 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
| 318 | 457 | |
|---|---|---|
| In service since | 1957 | 2025 |
| Region | Louisiana | Louisiana |
| Blocks assigned | 765 of 786 (97.3%) | 0 of 786 (0%) |
| Largest block holder | AT&T 44.3% | – |
| Complaints, 28 Sep – 30 Oct 2026 | 956 (#47) | not in the data |
| Rate centers | 119 | – |
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 318 and 457?
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 318 and 457?
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 318 or 457?
Whichever has blocks left – currently 457, at 0% allocated against 97.3% for the other. Carriers draw from the code with free blocks, which is why the newer code spreads over time.
Is 318 or 457 more likely to be a spam call?
The data does not support a comparison: only one of the two appears in the complaint window.
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: 318 · 457. All codes in Louisiana: Louisiana area codes.