447
Area code
IL
United States geographic area code, in service since 2021-03-27. Part of the 217/447 overlay complex — ten-digit dialing required.
Statusin service
Introduced2021-03-27
JurisdictionIL, US
Local dialing10D
Time zoneCentral
Last verified2026-09-17
Utilization 29.4% of assignable prefixes assigned
As of 09/17/2026
0%233 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 2021-02-01, most recent 2026-09-15.
Area codes serve rate-center geographies, not municipal boundaries. “IL” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | ONVOY, LLC | 58 | 24.9% |
| 02 | NEW CINGULAR WIRELESS PCS, LLC - IL | 38 | 16.3% |
| 03 | FRACTEL, LLC | 30 | 12.9% |
| 04 | MULTIPLE OCN LISTING | 9 | 3.9% |
| 05 | TON80 COMMUNICATIONS, LLC | 8 | 3.4% |
| 06 | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 8 | 3.4% |
| 07 | ONVOY SPECTRUM, LLC | 8 | 3.4% |
| 08 | NUSO, LLC | 8 | 3.4% |
| 09 | BOOST SUBSCRIBERCO L.L.C. | 7 | 3% |
| 10 | COMMIO, LLC | 6 | 2.6% |
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- 2019-10-28 NPA 447 to Overlay NPA 217 (Illinois)
- 2021-03-27Area code 447 entered service (created from 217).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2019-10-28 | PL-532 ↗ | NPA 447 to Overlay NPA 217 (Illinois) |