464
Area code
IL
United States geographic area code, in service since 2022-01-21. Part of the 464/708 overlay complex — ten-digit dialing required.
Statusin service
Introduced2022-01-21
JurisdictionIL, US
Local dialing1+10D
Time zoneCentral
Last verified2026-09-17
Utilization 15.8% of assignable prefixes assigned
As of 09/17/2026
0%125 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 2021-11-02, 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 | NEW CINGULAR WIRELESS PCS, LLC - IL | 57 | 45.6% |
| 02 | ONVOY, LLC | 20 | 16% |
| 03 | FRACTEL, LLC | 14 | 11.2% |
| 04 | MULTIPLE OCN LISTING | 9 | 7.2% |
| 05 | TON80 COMMUNICATIONS, LLC | 5 | 4% |
| 06 | 5 | 4% | |
| 07 | T-MOBILE USA, INC. | 4 | 3.2% |
| 08 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 3 | 2.4% |
| 09 | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 2 | 1.6% |
| 10 | EON TELECOM, INC. | 2 | 1.6% |
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- 2021-07-16 NPA 464 to Overlay NPA 708 (Illinois)
- 2022-01-21Area code 464 entered service (created from 708).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2021-07-16 | PL-562 ↗ | NPA 464 to Overlay NPA 708 (Illinois) |
| 1999-10-24 | PL-195 ↗ | NPA 872 to Overlay NPAs 312 and 773 (Illinois)NPA 464 to Overlay NPA 708NPA 331 to Overlay NPA 630 |