364
Area code
KY
United States geographic area code, in service since 2014-03-03. Part of the 270/364 overlay complex — ten-digit dialing required.
Statusin service
Introduced2014-03-03
JurisdictionKY, US
Local dialing10D
Time zoneEastern / Central
Last verified2026-09-17
Utilization 10.9% of assignable prefixes assigned
As of 09/17/2026
0%86 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 2017-03-06, most recent 2026-04-22.
Area codes serve rate-center geographies, not municipal boundaries. “KY” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | ONVOY SPECTRUM, LLC | 13 | 15.1% |
| 02 | ONVOY, LLC - KY | 10 | 11.6% |
| 03 | MULTIPLE OCN LISTING | 9 | 10.5% |
| 04 | TON80 COMMUNICATIONS, LLC | 8 | 9.3% |
| 05 | CORETEL KENTUCKY, INC. - KY | 5 | 5.8% |
| 06 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - KY | 5 | 5.8% |
| 07 | 5 | 5.8% | |
| 08 | IP HORIZON LLC | 4 | 4.7% |
| 09 | FRACTEL, LLC | 4 | 4.7% |
| 10 | NUSO, LLC | 3 | 3.5% |
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- 2013-01-29 NPA 364 to Overlay NPA 270 (Kentucky)
- 2014-03-03Area code 364 entered service (created from 270).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2013-01-29 | PL-449 ↗ | NPA 364 to Overlay NPA 270 (Kentucky) |