820
Area code
CA
United States geographic area code, in service since 2018-06-30. Part of the 805/820 overlay complex — ten-digit dialing required.
Statusin service
Introduced2018-06-30
JurisdictionCA, US
Local dialing1+10D
Time zonePacific
Last verified2026-09-17
Utilization 13.6% of assignable prefixes assigned
As of 09/17/2026
0%108 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 2018-06-25, most recent 2026-08-27.
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 | FRACTEL, LLC | 32 | 29.6% |
| 02 | NEW CINGULAR WIRELESS PCS, LLC | 16 | 14.8% |
| 03 | ONVOY, LLC - CA | 11 | 10.2% |
| 04 | MULTIPLE OCN LISTING | 9 | 8.3% |
| 05 | T-MOBILE USA, INC. | 8 | 7.4% |
| 06 | 5 | 4.6% | |
| 07 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 4 | 3.7% |
| 08 | COMMIO, LLC | 3 | 2.8% |
| 09 | TWILIO INTERNATIONAL, INC. | 2 | 1.9% |
| 10 | TON80 COMMUNICATIONS, LLC | 2 | 1.9% |
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- 2017-06-19 NPA 820 to Overlay NPA 805 (California)
- 2018-06-30Area code 820 entered service (created from 805).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2017-06-19 | PL-509 ↗ | NPA 820 to Overlay NPA 805 (California) |