+1 748 area code (Colorado)
What the numbering plan and the regulator's allocation table say about numbers starting +1 748: the place, the line types, every block's status and the carriers those blocks were allocated to. Original allocation, not who serves a number today, and never who owns or calls from a number.
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NANPA’s NPA report of 27 September 2026 puts 748 in service since 7 July 2025, as an overlay of 970; its central office code file of the same day lists no central office code assigned in it yet.
The range at a glance
| Country | United States (US) |
|---|---|
| Calling code | +1 |
| Prefix | 748 |
| Place named for the range | Colorado |
| Time zones | America/Denver (Mountain Standard Time, UTC−7, UTC−6 in daylight saving time) |
| Line types by the numbering plan | fixed_line_or_mobile |
| Example format | +1 748-211-0000 |
+1 748 in NANPA’s area code report
+1 748 is a North American area code for Colorado, in service since 7 July 2025, sharing its area with 970, per NANPA’s NPA report of 27 September 2026. NANPA names 970 as the code it came from: the two serve one area, so a new number there can get either code.
Codes assigned in the last 12 months, and codes not yet in service
NANPA’s central office code file of 27 September 2026 lists 0 codes in 748 assigned in the 12 months to 27 September 2026. Nothing is waiting to enter service. NANPA dates codes from 2001 on only: 0 of the 0 codes carry a date, so an undated code is not a new one. A code not yet in service is waiting for its effective date; a reassigned block can hold numbers used before. Original allocation, not who serves a number today.
Blocks in the regulator's table
Each block is a 6-digit prefix of the national number. A number in an allocated block is assignable; in an unassigned block no carrier can have a subscriber, so the lookup answers unassigned_block for it, except a number in a range reserved for fiction (is_fictional), which answers valid even where the regulator lists its block as protected. Of the allocated blocks, n/a belong to a wireless carrier, n/a to a virtual-number wholesaler or VoIP provider, and n/a to a holder whose name settles neither.
| Allocated | 0 |
|---|---|
| Unassigned | 0 |
| Reserved | 14 |
| Total blocks | 14 |
How to read this page
Everything above comes from three public sources: the numbering metadata, which names the zones and the line types of the range and, outside North America, its place; and the regulator's allocation table, which lists each block's status and holder and, in North America, the rate centres the place is named from. NANPA’s NPA report adds what it says about the whole area code: its state or province, the codes sharing its area, when it went into service, local dialling and relief planning. None of them knows who serves a number today, whether a handset is switched on, or who owns or answers it. Spaw reports what the tables say and names the dataset and version behind every answer.
More area codes in the United States
- +1 738
- +1 740
- +1 743
- +1 747
- +1 754
- +1 757
- +1 760
- +1 762
- All area codes in Colorado
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nanpa-co-codes 2026-09-27 · nanpa-rate-centres 2026-09-20 · nanpa-npa-report 2026-09-27 · data synced on 2026-09-27 · about the regulator’s table
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