Area Code 408: Comprehensive Guide to Coverage and Regulations
Area code 408 serves the southern San Francisco Bay Area, encompassing parts of Santa Clara County and Northern Santa Cruz County in California.
Overview of Area Code 408
Area code 408 is an integral part of California's telecommunications, covering key regions in the Bay Area. Established in 1959, it supports a diverse range of services and carriers.
Basic Technical Specifications
- NPA Code: 408
- Type: Overlay
- Implementation Date: March 1, 1959
- State: California
Geographic Coverage
Area code 408 primarily covers Santa Clara County and parts of Northern Santa Cruz County, including major urban centers such as San Jose, Santa Clara, and Sunnyvale.
Major Cities
| City | Latitude | Longitude |
|---|---|---|
| Campbell | 37.28717 | -121.94996 |
| Gilroy | 37.00578 | -121.56828 |
| Los Gatos | 37.22661 | -121.97468 |
| Milpitas | 37.42827 | -121.90662 |
| Morgan Hill | 37.1305 | -121.65439 |
| San Jose | 37.33939 | -121.89496 |
| Santa Clara | 37.35411 | -121.95524 |
| Saratoga | 37.26383 | -122.02301 |
| Sunnyvale | 37.36883 | -122.03635 |
Numbering Statistics
- Total Numbers Available: Approximately 7.92 million
- Utilization Rate: 70%
- Exhaust Projection: 2025
Network Infrastructure
Major Carriers
- AT&T: 40%
- Verizon: 30%
- T-Mobile: 20%
- Others: 10%
Types of Services
- Landline
- Wireless
- VoIP
Regulatory Framework
- Regulatory Body: California Public Utilities Commission (CPUC)
- Dialing Requirements: 10-digit dialing mandatory since October 20, 2012
- NANPA Regulations: Compliance with North American Numbering Plan Administration (NANPA) guidelines
Historical Milestones
- 1959: Area code 408 split from area code 415
- 1998: Geographic split to create area code 831
- 2012: Overlay with area code 669 implemented
Conclusion
Area code 408 remains a crucial element of the telecommunications network in California's Bay Area. It has adapted through geographic splits and overlays to meet the growing demand for connectivity, supporting a wide array of services and providers.
For more information on area codes and their management, visit the North American Numbering Plan Administration website.