Where Is 858 Area Code?

Where Is Area Code 858?

The 858 area code encompasses a significant portion of northern San Diego County in California. Its coverage extends through several prominent communities and municipalities within the region. Individuals and businesses within this code benefit from substantial infrastructure, public services, and proximity to major coastal and inland attractions.

• Major cities and areas:

• San Diego
• Chula Vista
• El Cajon
• National City
• La Mesa

Residents seeking more precise boundary information—or who require additional regulatory guidance—are encouraged to consult the California Public Utilities Commission phone services section or visit their offices at 505 Van Ness Avenue, San Francisco, CA 94102. Stakeholders may also obtain county-level data by contacting the 1600 Pacific Highway, San Diego, CA 92101 administrative center.

What Time Zone Is 858 Area Code in the USA?

The 858 area code operates within the Pacific Time Zone (PT). This time zone observes Pacific Standard Time (PST) during non-daylight saving months and shifts to Pacific Daylight Time (PDT) when daylight saving is in effect. As a result, individuals and businesses within the 858 area code experience a one-hour adjustment in the spring and autumn each year.

• Standard designation: Pacific Standard Time (UTC-8)
• Daylight saving designation: Pacific Daylight Time (UTC-7)
• Official timekeeping resources: National Institute of Standards and Technology

For any clarifications on nationwide time standards, agencies and individuals may contact the 100 Bureau Drive, Gaithersburg, MD 20899 offices of the National Institute of Standards and Technology.

History of the 858 Area Code

The origin of the 858 area code reflects efforts by state and federal agencies to maximize the allocation of telephone numbers. Below is a concise summary of key developments:

The Federal Communications Commission’s area code guidelines provide detailed regulatory frameworks for area code creation and management. Inquiries regarding historical records and official rulings may be directed to the FCC at 45 L Street NE, Washington, DC 20554. Additionally, the California Public Utilities Commission historical records are available at 505 Van Ness Avenue, San Francisco, CA 94102.

How Many People Use the 858 Area Code?

Population estimates for the coverage area reflect consistent usage in both residential and commercial contexts. Given San Diego County’s high concentration of research institutions, technology firms, and housing developments, the volume of assigned 858 numbers remains substantial.

• Current estimates indicate more than one million individuals reside or work within the 858 boundaries.
• Business lines constitute a significant portion of area code usage, with major industries including biotechnology, aerospace, tourism, and academic research.
• The California Public Utilities Commission data center organizes updated statistics on active numbers and newly assigned lines.

Government offices, including 505 Van Ness Avenue, San Francisco, CA 94102 (CPUC) and 1600 Pacific Highway, San Diego, CA 92101 (County Administrative Center), offer additional data for entities requiring detailed demographic or infrastructural information.

Is the 858 Area Code Toll-Free?

The 858 area code is classified as a standard geographic area code rather than as a toll-free designation. Calls placed to numbers within this area code, whether local or long-distance, are subject to service provider charges, in accordance with existing telecommunication regulations.

• Toll-free area codes in the United States typically include 800, 888, 877, 866, 855, 844, and 833.
• Calls to 858 numbers follow regular billing practices and may incur long-distance fees if dialed from outside the local calling zone.
• For official guidance on toll-free regulations, consult the FCC  or visit 45 L Street NE, Washington, DC 20554.

Users requiring additional details on toll-free parameters or billing practices are encouraged to review their subscription agreements or contact the Federal Communications Commission consumer help center.