858 area code — La Jolla, CA geographic
- State
- California
- Major area
- La Jolla
- Time zone
- Pacific
- In service since
- 1999-06-12
- Split from
- 619
- Overlay complex
- 619 / 858
- Active prefixes
- 554
- Rate centers
- 19
- Carriers
- 38
- Projected exhaust
- 3Q 2039
Area code 858 is a geographic code serving La Jolla, California in the Pacific time zone. It has been in service since June 12, 1999. The same territory is also served by its overlay code (619/858 complex). Keep in mind the code identifies where the number was registered; the person calling may be elsewhere.
The code currently holds 554 working prefixes, held by 38 different carriers. Of these, 411 are pooled prefixes shared by multiple carriers. Numbers are anchored to 19 rate centers — billing localities that fix where each prefix belongs.
The code was carved out of 619 (1999).
The current NANPA exhaust forecast for the 619/858 complex is 3Q 2039.
Local calls inside 858 are dialed 1+10D.
Practical takeaway: the 858 label narrows geography to California, the prefix narrows it to a locality, and neither authenticates a caller. Verification means calling back through a number you found yourself.
Largest localities in 858
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| La Jolla | 166 | 619 |
| San Diego:linda Vista Da | 80 | 619 |
| San Diego:mira Mesa Da | 68 | 619 |
| Poway | 45 | 619 |
| Del Mar | 45 | 619 |
| Rancho Bernardo | 41 | — |
| Rancho Penasquitos | 21 | — |
| San Diego:san Diego Da | 21 | 619, 760 |
| Chula Vista | 17 | 619 |
| Rancho Santa Fe | 14 | 619 |
FAQ
Is 858 a toll-free number?
No. 858 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.
Why do 619 and 858 cover the same place?
They are overlays: when a code runs low on numbers, a new code is added over the same territory instead of splitting it. The 619/858 complex shares one service area, and local calls are dialed with 10 digits.
Will 858 run out of numbers?
NANPA's current forecast projects exhaust in 3Q 2039 — decades of capacity remain.
Why am I getting spam calls from 858 numbers?
Scammers spoof recognizable area codes so calls look local or familiar. A displayed 858 number does not prove the call originated there — see our guide to spotting spoofed calls.
Where is a 858 number from?
858 is assigned to La Jolla and surrounding areas of California in the Pacific time zone. The three digits after the area code (the prefix) narrow it down to a rate center.