321
Area code
Statusin service
Introduced1999-11-01
JurisdictionFL, US
Local dialing10D
Time zoneEastern
Last verified2026-09-17
Utilization 65% of assignable prefixes assigned
As of 09/17/2026
0%515 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 2001-01-16, most recent 2026-08-24.
Area codes serve rate-center geographies, not municipal boundaries. “FL” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 70 | 13.6% |
| 02 | OMNIPOINT MIAMI E LICENSE, LLC | 59 | 11.5% |
| 03 | NEW CINGULAR WIRELESS PCS, LLC - GA | 52 | 10.1% |
| 04 | PAETEC ITEL, LLC | 46 | 8.9% |
| 05 | ONVOY, LLC - FL | 39 | 7.6% |
| 06 | METROPCS NETWORKS, LLC | 39 | 7.6% |
| 07 | LEVEL 3 COMMUNICATIONS, LLC - FL | 31 | 6% |
| 08 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL | 26 | 5% |
| 09 | BANDWIDTH.COM CLEC, LLC - FL | 16 | 3.1% |
| 10 | FRACTEL, LLC | 15 | 2.9% |
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- 1999-11-01Area code 321 entered service (created from 407).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2021-01-08 | PL-556 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Lifeline) – supersedes PL-544 |
| 2020-08-17 | PL-544 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline |
| 2018-09-13 | PL-519 ↗ | NPA 689 to Overlay 407 and 321 NPAs (Florida) |
| 2002-06-03 | PL-325 ↗ | 689 NPA Implementation Suspended (Central Florida) |
| 2002-04-30 | PL-323 ↗ | 689 NPA To Overlay 407 and 321 NPAs (Central Florida) |
| 1999-04-07 | PL-168 ↗ | NANP Split Boundary Extension Concentrated Overlay of 407 (Florida) NPA with 321 NPA |