North American Numbers Source-cited · ownership disclosed
Area code
820
In service
United States · since 2018

Central Coast (overlay)

Area code 820 is an all-services overlay of area code 805, serving the same central California coast territory. It became available in June 2018.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Central Coast (overlay)
Type
geographic
Status
in service
In service since
2018
Projected exhaust
2074 Q3

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 820 is

Same as 805: San Luis Obispo, Santa Barbara and Ventura counties, plus the southernmost portion of Monterey County..

Communities served wholly or partly by 820:

Santa BarbaraVenturaOxnardSan Luis ObispoPaso RoblesLompoc

Serves the same territory as 805; representative list.

B · Relationships

How it relates to other codes

The codes 820 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2018 805 Santa Barbara / Ventura / San Luis Obispo 820 is an all-services overlay placed over the entire 805 numbering plan area.
What's changing. All-services overlay of area code 805 since June 2018; ten-digit dialing is mandatory.
C · History

How 820 got here

2017-05-25
California PUC approved area code 820 as an all-services overlay of 805.
Source: Wikipedia
2018-06
Area code 820 became available for assignment; ten-digit dialing required for all calls.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
109
Prefixes available
691
Thousands-blocks assigned
814

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 820 with another code →
Sources
Wikipedia ↗
Area codes 805 and 820
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.