Area Code 858
California
Area code 858 serves California, primarily San Diego, in the Pacific Time (PT) time zone. It is an overlay area code sharing territory with area code 619.
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 619 (San Diego).
In service since: 12-Jun-1999
Demographics & Economics
- Total Population
- 2,371,073
- Population Density
- 780 people/sq miabove U.S. average (U.S.: 93 people/sq mi)
- Median Household Income
- $102,285above U.S. median (U.S.: $75,144)
- Poverty Rate
- 10.4%near U.S. average (U.S.: 11.5%)
- Unemployment Rate
- 6.2%above U.S. average (U.S.: 3.6%)
- Education Attainment
- Bachelor's Degree+42.1%above U.S. average (U.S.: 33.7%)High School or Lower23.9%
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
Prefix Utilization
Geographic Coverage
State
CA
Major Cities
- San Diego
- Chula Vista
- El Cajon
- Encinitas
- La Mesa
- Santee
- Poway
- La Presa
- Lemon Grove
- Imperial Beach
- Rancho San Diego
- Winter Gardens
- Casa de Oro-Mount Helix
- Coronado
- Bostonia
- Alpine
- Bonita
- Solana Beach
- Jamul
- Eucalyptus Hills
- Harbison Canyon
- Del Mar
- Granite Hills
- Crest
and 12 more cities
History
Area code 858 serves as an overlay for the same territory as area code 619. It was introduced in 1999 to provide additional phone number capacity for the region. It shares its territory with area code area code 619.
Demographics
The estimated population served by area code 858 is approximately 2,371,073. The population density is 780 people per square mile, which is higher than the national average of 93. The median household income is $102,285, which is higher than the national median of $75,144. Approximately 42.1% of adults hold a bachelor's degree or higher, compared to the national rate of 33.7%. This rate is higher than the national average. The poverty rate stands at 10.4%, which is near the national rate of 11.5%.
County Coverage
Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 858).
| County | Population | Share |
|---|---|---|
| San Diego, CA | 2,371,073 | 100.0% |
Area Code 858 Family Tree
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Area code 858 was originally assigned in 12-Jun-1999 to serve CA.
Call Context
This area code covers a geographic region across CA, including San Diego and surrounding communities.
Nearby Area Codes
Area codes geographically closest to 858.
Other Area Codes in California
Area codes that also serve California, linked for easy comparison.