435
Area code
Statusin service
Introduced1997-09-21
JurisdictionUT, US
Local dialing7D
Time zoneMountain
Last verified2026-09-17
Utilization 66.3% of assignable prefixes assigned
As of 09/17/2026
0%525 of ~792 assignable NXX values (200–999 excl. N11)100%
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2001-02-02, most recent 2026-09-15.
Area codes serve rate-center geographies, not municipal boundaries. “UT” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT | 63 | 12% |
| 02 | QWEST CORPORATION | 58 | 11% |
| 03 | NEW CINGULAR WIRELESS PCS, LLC | 55 | 10.5% |
| 04 | ONVOY, LLC - UT | 43 | 8.2% |
| 05 | T-MOBILE USA, INC. | 41 | 7.8% |
| 06 | CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT | 28 | 5.3% |
| 07 | SOUTH CENTRAL UTAH TEL. ASSN., INC. | 24 | 4.6% |
| 08 | LEVEL 3 COMMUNICATIONS, LLC - UT | 23 | 4.4% |
| 09 | 15 | 2.9% | |
| 10 | UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS | 13 | 2.5% |
Important: these are initial assignees from NANPA CO-code records — the carrier a prefix was originally assigned to. Because of number portability, the current serving carrier of any individual number may differ.
Change history
Recorded events for this NPA- 1997-09-21Area code 435 entered service (created from 801).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 1998-06-12 | PL-126 ↗ | Extension of Permissive Dialing Period for Utah 801 and 435 NPA Relief; Reference PL-NANP-065 |
| 1997-05-30 | PL-065 ↗ | NANP- Split of 801 (Utah) Numbering Plan Area (NPA) |