314
Area code
MO
United States geographic area code, in service since 1947-01-01. Part of the 314/557 overlay complex — ten-digit dialing required.
Statusin service
Introduced1947-01-01
JurisdictionMO, US
Local dialing10D
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 2001-01-17, most recent 2026-05-21.
Area codes serve rate-center geographies, not municipal boundaries. “MO” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | SOUTHWESTERN BELL | 255 | 31.9% |
| 02 | NEW CINGULAR WIRELESS PCS, LLC - IL | 101 | 12.6% |
| 03 | T-MOBILE USA, INC. | 94 | 11.8% |
| 04 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO | 53 | 6.6% |
| 05 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 51 | 6.4% |
| 06 | ONVOY, LLC - MO | 50 | 6.3% |
| 07 | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 26 | 3.3% |
| 08 | LEVEL 3 COMMUNICATIONS, LLC - MO | 24 | 3% |
| 09 | AMERICAN MESSAGING SERVICES, LLC | 20 | 2.5% |
| 10 | PAETEC ITEL, LLC | 19 | 2.4% |
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- 2021-10-28 NPA 557 to Overlay NPA 314 (Missouri)
- 2001-05-09 NPA 557 Overlay of NPA 314 Implementation Date and Dialing Plan Change (Missouri)
- 1947-01-01Area code 314 entered service.
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2021-10-28 | PL-567 ↗ | NPA 557 to Overlay NPA 314 (Missouri) |
| 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 |
| 2001-10-05 | PL-303 ↗ | Suspension of the 314 NPA Relief (Missouri) |
| 2001-05-09 | PL-279 ↗ | NPA 557 Overlay of NPA 314 Implementation Date and Dialing Plan Change (Missouri) |
| 2001-02-14 | PL-261 ↗ | New NPA 557 to Overlay NPA 314 (Missouri) |