Buy a Local Phone Number – Area Code 858 (San Diego, California)

Established in 1999 through a split from 619, 858 serves northern San Diego neighborhoods and adjacent coastal cities. Its footprint includes La Jolla, Del Mar, Torrey Pines, Sorrento Valley, University City, Carmel Valley, Rancho Bernardo, and Poway. The split reflected rapid suburban growth and the rise of research campuses along the mesas north of Mission Valley. Ten‑digit dialing is now standard in the region, aligning local practice with neighboring codes across the San Diego metropolitan area.

As a numbering space, the code maps closely onto the county’s innovation belt anchored by UC San Diego, Scripps Research, the Salk Institute, and Torrey Pines Science Park. Wireless and semiconductor firms clustered around Sorrento Valley—most notably Qualcomm—share the corridor with startups and contract research organizations. Defense and aerospace suppliers operate in Poway and Rancho Bernardo, including firms focused on unmanned systems and avionics. Cultural cues skew coastal and academic: marine science at La Jolla Shores, the Del Mar racing season and fairgrounds, and open‑space recreation at Torrey Pines State Natural Reserve.

• Biotech and life sciences (drug discovery, genomics, medical devices)
• Wireless, telecommunications, and semiconductors
• Defense, aerospace, and unmanned systems manufacturing
• Higher education and oceanographic research
• Tourism, outdoor recreation, and events at Del Mar Fairgrounds