630
Area code
IL
United States geographic area code, in service since 1996-08-03. Part of the 331/630 overlay complex — ten-digit dialing required.
Statusin service
Introduced1996-08-03
JurisdictionIL, US
Local dialing1+10D
Time zoneCentral
Last verified2026-09-17
Utilization 101% of assignable prefixes assigned
As of 09/17/2026
0%800 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 2001-01-03, most recent 2026-07-21.
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 | ILLINOIS BELL TEL CO | 258 | 32.3% |
| 02 | NEW CINGULAR WIRELESS PCS, LLC - IL | 103 | 12.9% |
| 03 | T-MOBILE USA, INC. | 76 | 9.5% |
| 04 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 75 | 9.4% |
| 05 | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 57 | 7.1% |
| 06 | LEVEL 3 COMMUNICATIONS, LLC - IL | 56 | 7% |
| 07 | PAETEC ITEL, LLC | 35 | 4.4% |
| 08 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 34 | 4.3% |
| 09 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 26 | 3.3% |
| 10 | SPOK, INC. | 14 | 1.8% |
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- 2007-07-06 NPA 331 to Overlay NPA 630 (Illinois)
- 1996-08-03Area code 630 entered service (created from 708).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2007-07-06 | PL-362 ↗ | NPA 331 to Overlay NPA 630 (Illinois) |
| 2006-11-27 | PL-357 ↗ | NPA 331 to Overlay NPA 630 (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 |
| 1995-07-27 | IL-95-07-015 ↗ | NANP-SPLIT OF 708 (ILLINOIS) NUMBERING PLAN AREA (NPA) |