Area codes 805 and 820

805area code 805805 & 820805/820805, 820
Area codes 805 and 820 are California telephone area codes; 805 was originally split from area code 213 in 1957.wikipedia
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Area code 661

661
On February 13, 1999, area code 805 was split, with area code 661 having been created for the inland areas, which are San Joaquin Valley, Santa Clarita Valley, and Antelope Valley.
It was split from area code 805 on February 13, 1999.

Area codes 213 and 323

323213area code 213
Area codes 805 and 820 are California telephone area codes; 805 was originally split from area code 213 in 1957.
In 1957, 213 was restricted to Los Angeles County, with most of the old 213's northern and western portion becoming area code 805.

Los Osos, California

Los Osos, CaliforniaLos Osos, California, 2006
The community is part of the 93402 and 93412 ZIP codes and area code 805.

San Simeon, California

San SimeonSan Simeon, CAhome
San Simeon (ZIP Code: 93452; area code 805) is a town and census-designated place on the Pacific coast of San Luis Obispo County, California.

Gorda, California

Gorda
The ZIP Code is 93920, but mail must be addressed to Big Sur, and the community is inside area code 805.

Los Olivos, California

Los Olivos
The ZIP Code is 93441, and the community is within the area code 805.

Hope Ranch, California

Hope Ranch
The ZIP codes are 93105 and 93110, and the community is in area code 805.

Cuyama, California

Cuyama
The ZIP Code is 93254, and the community is inside area code 805.

Santa Barbara County, California

Santa Barbara CountySanta BarbaraSanta Barbara Counties
They include most or all of the California counties of San Luis Obispo, Santa Barbara, Ventura, plus the southernmost portions of Monterey County.

Ventura County, California

Ventura CountyVenturaVentura Counties
They include most or all of the California counties of San Luis Obispo, Santa Barbara, Ventura, plus the southernmost portions of Monterey County.

Monterey County, California

Monterey CountyMontereyMonterey Counties
They include most or all of the California counties of San Luis Obispo, Santa Barbara, Ventura, plus the southernmost portions of Monterey County.

Paso Robles, California

Paso RoblesPaso Robles, CAEl Paso de Robles (Paso Robles)
Area code 805 also serves the US military facilities in Kwajalein, Republic of the Marshall Islands with a Paso Robles prefix (805-355-xxxx).

La Conchita, California

La ConchitaLa Conchita, CAPunta
The ZIP Code is 93001, and the community is inside area code 805.

Newbury Park, California

Newbury ParkNewbury Park, CAfauna
It makes up all of ZIP code 91320, and is within area code 805.