320
Area code
Statusin service
Introduced1996-03-17
JurisdictionMN, US
Local dialing7D
Time zoneCentral
Last verified2026-09-17
Utilization 67.6% of assignable prefixes assigned
As of 09/17/2026
0%535 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 2001-02-05, most recent 2026-09-14.
Area codes serve rate-center geographies, not municipal boundaries. “MN” 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 - MN | 58 | 10.8% |
| 02 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN | 57 | 10.7% |
| 03 | QWEST CORPORATION | 42 | 7.9% |
| 04 | NEW CINGULAR WIRELESS PCS, LLC - IL | 28 | 5.2% |
| 05 | CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN | 27 | 5% |
| 06 | CENTURYLINK OF MINNESOTA, INC. | 24 | 4.5% |
| 07 | LEVEL 3 COMMUNICATIONS, LLC - MN | 23 | 4.3% |
| 08 | AERIAL COMMUNICATIONS, INC. | 22 | 4.1% |
| 09 | FRACTEL, LLC | 17 | 3.2% |
| 10 | MCC TELEPHONY OF MINNESOTA, LLC - MN | 15 | 2.8% |
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- 1996-03-17Area code 320 entered service (created from 612).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 1996-01-30 | IL-96-01-017 ↗ | REVISIONS TO THE SPLIT OF 612 (MINNESOTA) NUMBERING PLAN AREA (NPA) |
| 1995-09-15 | IL-95-09-007 ↗ | NANP-SPLIT OF 612 (MINNESOTA) NUMBERING PLAN AREA (NPA) |