Area Code 820

California

Area code 820 serves California, primarily Oxnard, in the Pacific Time (PT) time zone. It is an overlay area code sharing territory with area code 805.

Overlay Area Code

This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.

This area code shares its geographic region with: area code 805 (Oxnard).

In service since: 30-Jun-2018

Learn more about overlay and split area codes →

Demographics & Economics

Total Population: 1,758,572
Population Density: 188 people/sq mi
above U.S. average (U.S.: 93 people/sq mi)
Median Household Income: $95,977
above U.S. median (U.S.: $75,144)
Poverty Rate: 11.3%
near U.S. average (U.S.: 11.5%)
Unemployment Rate: 5.6%
above U.S. average (U.S.: 3.6%)
Education Attainment: Bachelor's Degree+
36.4%
near U.S. average (U.S.: 33.7%)
High School or Lower
27.0%

Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.

See how this area code compares to all US area codes in the Statistics dashboard.

Time Zone

Pacific Time (PT)

NANPA Relief Status

According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.

Source: NANPA NPA Relief Planning Reports · See all relief planning statuses

Current Time

Pacific Time (PT)

Prefix Utilization

Geographic Coverage

State

Major Cities

Oxnard
Simi Valley
Thousand Oaks
San Buenaventura (Ventura)
Santa Maria
Santa Barbara
Camarillo
San Luis Obispo
Lompoc
Moorpark
Goleta
El Paso de Robles (Paso Robles)
Orcutt
Santa Paula
Atascadero
Eastern Goleta Valley
Port Hueneme
Arroyo Grande
Nipomo
Fillmore
Los Osos
Isla Vista
Carpinteria
Grover Beach

and 56 more cities

Area Code 820 geographic coverage map (light mode)

Demographics

The estimated population served by area code 820 is approximately 1,758,572. The population density is 188 people per square mile, which is higher than the national average of 93. The median household income is $95,977, which is higher than the national median of $75,144. Approximately 36.4% of adults hold a bachelor's degree or higher, compared to the national rate of 33.7%. This rate is near the national average. The poverty rate stands at 11.3%, which is near the national rate of 11.5%.

History

Area code 820 serves as an overlay for the same territory as area code 805. It was introduced in 2018 to provide additional phone number capacity for the region. It shares its territory with area code area code 805.