Area code 748 vs 970
748 and 970 are overlay codes: they cover the same ground in Colorado, and a number in one is a local call to the other. 970 is the original, in service since 1995. 748 was added in 2025 because the first was filling up – that is what an overlay is for. Today 748 has 9 of 786 blocks assigned (1.1%) and 970 has 786 of 786 (100.0%), so a new number in the area now almost always comes from 748. 970 appears in the complaint data with 1,101 complaints in the window; 748 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
| 748 | 970 | |
|---|---|---|
| In service since | 2025 | 1995 |
| Region | Colorado | Colorado |
| Blocks assigned | 9 of 786 (1.1%) | 786 of 786 (100%) |
| Largest block holder | Onvoy 55.6% | Lumen 33.7% |
| Complaints, 28 Sep – 30 Oct 2026 | not in the data | 1,101 (#28) |
| Rate centers | 9 | 120 |
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 748 and 970?
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 748 and 970?
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 748 or 970?
Whichever has blocks left – currently 748, at 1.1% allocated against 100.0% for the other. Carriers draw from the code with free blocks, which is why the newer code spreads over time.
Is 748 or 970 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: 748 · 970. All codes in Colorado: Colorado area codes.