Geographic Coverage & Key Cities

The 510 area code encompasses California's vibrant East Bay region, serving 22 cities across four counties. It's the calling card for Oakland's urban energy, where businesses thrive, Berkeley's innovative spirit, Fremont's tech scene, and Hayward's diverse community. The Berkeley Hills create a natural boundary between different area codes in the region.

In Bay Area phone code history, the 510 has serious street cred, established on September 2, 1991, when it was split from the original 415 area code to accommodate the growing population and telecommunications demand in the East Bay. Later, on March 14, 1998, the inland portion of the East Bay was split off as area code 925, with the Berkeley Hills serving as the dividing line; areas west of the hills remained in area code 510, while the eastern regions moved to area code 925. To address number exhaustion, the 510 area code now shares its territory with the newer overlay code 341, introduced in 2019, which required ten-digit dialing across the region.

Having a 510 number plants your business firmly in the San Francisco Bay Area ecosystem, connecting you to a diverse and economically vibrant region known for its innovation, culture, and community.

Key Economic Zones & Business Hubs

  • Major Cities: Oakland, Berkeley, Fremont, Hayward, Alameda, San Leandro, Richmond, Emeryville
  • Economic Zones: Port of Oakland shipping operations, UC Berkeley research corridor, biotech manufacturing belt
  • Business Hubs: Jack London Square, Berkeley university district, Fremont tech corridor
  • Neighboring Area Codes: 341 (overlay), 415/628 (San Francisco), 650 (Peninsula), 925 (eastern suburbs)
  • Strategic Industries: Shipping logistics, biotechnology, sustainable tech, artisanal food production

Time Zone & Business Impact

The 510 area code follows Pacific Time (GMT -08:00), which is Pacific Standard Time (PST) during standard time and Pacific Daylight Time (PDT) when daylight saving time is in effect. With a 510 number, you're perfectly in sync with San Francisco's financial district and Silicon Valley's tech campuses. The three-hour time difference from Eastern Time gives you a significant operational advantage; you can catch East Coast clients before their day ends, then still have plenty of time for local business in the afternoon.

Working with international clients becomes seamless when you're wrapping up your day in Oakland or Berkeley, as Tokyo and Shanghai are just starting theirs, perfect timing for handoffs and international collaboration. GoodCall's AI answering service catches every call 24/7 in this always-on Bay Area environment.

Time Zone Advantages

  • Bay Area Synchronization: Perfect alignment with San Francisco financial district and Silicon Valley schedules
  • East Coast Extension: Three-hour advantage allows extended business day communication with Eastern clients
  • International Handoffs: Optimal timing for Asian market collaboration and 24/7 global operations
  • Innovation Economy: Matches the fast-paced, always-on culture of the Bay Area tech ecosystem
  • Competitive Edge: AI services provide round-the-clock availability while competitors send callers to voicemail
  • Flexible Operations: Support for diverse work styles from downtown Oakland to remote Berkeley locations