840
Area code
CA
United States geographic area code, in service since 2021-02-23. Part of the 840/909 overlay complex — ten-digit dialing required.
Statusin service
Introduced2021-02-23
JurisdictionCA, US
Local dialing1+10D
Time zonePacific
Last verified2026-09-17
Utilization 17.7% of assignable prefixes assigned
As of 09/17/2026
0%140 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 2020-12-23, most recent 2026-08-11.
Area codes serve rate-center geographies, not municipal boundaries. “CA” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | T-MOBILE USA, INC. | 32 | 22.9% |
| 02 | FRACTEL, LLC | 26 | 18.6% |
| 03 | ONVOY, LLC - CA | 22 | 15.7% |
| 04 | NEW CINGULAR WIRELESS PCS, LLC | 17 | 12.1% |
| 05 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 12 | 8.6% |
| 06 | MULTIPLE OCN LISTING | 9 | 6.4% |
| 07 | 5 | 3.6% | |
| 08 | BANDWIDTH.COM CLEC, LLC - CA | 4 | 2.9% |
| 09 | TERRA NOVA TELECOM INC. | 3 | 2.1% |
| 10 | ONVOY SPECTRUM, LLC | 3 | 2.1% |
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- 2019-07-23 NPA 840 to Overlay 909 (California) other
- 2021-02-23Area code 840 entered service (created from 909).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2019-07-23 | PL-529 ↗ | NPA 840 to Overlay 909 (California) |