858 Area Code: San Diego, California
From the North American Numbering Plan Administrator (NANPA), checked October 13, 2026.
858 is a San Diego, California area code. Under a boundary elimination overlay, 619 and 858 serve the same places.
Local 858 numbers available
30 or more
Twilio's number search found 30 or more local 858 numbers that can take calls, checked October 15, 2026. CallFlux buys its tracking numbers through Twilio. We run this search at most once a day, and one search lists at most 30 numbers, so 30 means 30 or more.
858 area code at a glance
Places the 858 area code covers
“The 619 and 858 NPAs generally serve the City of San Diego”
“as well as unincorporated portions of San Diego County”
NANPA's map of 858 is in Planning Letter PL-507 (PDF).[13]
Rate centers NANPA lists for 858
NANPA's rate center report lists 19 rate centers for 858, as of October 13, 2026.[15]
- Campo
- Chula Vista
- Coronado
- Del Mar
- Dulzura
- El Cajon
- Harbison-Alpine
- Jacumba
- La Jolla
- La Mesa
- National City
- Pine Valley
- Poway
- Rancho Bernardo
- Rancho Penasquitos
- Rancho Santa Fe
- San Diego: Linda Vista DA
- San Diego: Mira Mesa DA
- San Diego: San Diego DA
Area codes that share the 858 area
In an overlay, more than one area code serves the same area. NANPA lists 858 in the 619/858 overlay. So 619 serves the same area as 858.[3]
“approved a boundary elimination overlay as the relief method for the 619 NPA”
“The new 619-858 NPA Overlay will be an all-services overlay and will serve the same geographic areas currently served by the existing 619 and 858 NPAs.”
Get a local 858 tracking number
CallFlux tracking numbers are picked by area code. In the CallFlux dashboard you type 858, search the numbers available in it and choose one. Calls to that number forward to the phone you set, and you can record them, assign the number to a campaign and swap it onto your website, so each call shows which ad or page it came from.
A local tracking number is $1.15 a month, on top of a CallFlux plan.
Frequently asked questions
Where is the 858 area code?
858 is a San Diego, California area code. Under a boundary elimination overlay, 619 and 858 serve the same places.
What area codes share the 858 area?
NANPA lists 858 in the 619/858 overlay. So 619 serves the same area as 858.
What time zone is the 858 area code in?
NANPA lists Pacific as the predominant time zone for 858.
How do you dial a local call in the 858 area code?
NANPA lists 1 + 10 digits as the predominant way to dial both local and toll calls within 858.
When did the 858 area code start?
NANPA lists June 12, 1999 as the date 858 was placed in service.
Can I get a local 858 phone number for my business?
Yes. CallFlux tracking numbers are picked by area code: type 858 in the CallFlux dashboard, search the numbers available and choose one. Our latest search, on October 15, 2026, found 30 or more. A local tracking number is $1.15 a month, on top of a CallFlux plan.
Sources
Every fact on this page, the words it rests on and the date it was checked. NANPA writes NPA for an area code.
[1] NANPA lists 858 as an area code in California.
“LOCATION: CA”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[2] NANPA lists June 12, 1999 as the date 858 was placed in service.
“IN_SERVICE_DT: 12-Jun-1999”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[3] NANPA lists 858 as part of the 619/858 overlay.
“OVERLAY_COMPLEX: 619/858”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[4] NANPA lists 619 as the parent area code of 858.
“PARENT_NPA_ID: 619”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[5] NANPA lists Pacific as the predominant time zone of 858.
“TIME_ZONE: P”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[6] NANPA's TIME_ZONE field gives a code's predominant time zone or zones.
“Predominant time zone(s) for NPA”
NANPA NPA Database field definitions · checked October 13, 2026
[7] In NANPA's field definitions, P stands for Pacific.
“P-Pacific”
NANPA NPA Database field definitions · checked October 13, 2026
[8] NANPA lists 1 + 10 digits as the predominant way to dial a local call within 858.
“HOME_NPA_LOCAL_CALLS: 1+10D”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[9] NANPA's HOME_NPA_LOCAL_CALLS field gives the predominant dialing pattern for local calls.
“Predominant dialing pattern on Home NPA Local Calls”
NANPA NPA Database field definitions · checked October 13, 2026
[10] NANPA lists 1 + 10 digits as the predominant way to dial a toll call within 858.
“HOME_NPA_TOLL_CALLS: 1+10D”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[11] NANPA's HOME_NPA_TOLL_CALLS field gives the predominant dialing pattern for toll calls.
“Predominant dialing pattern on Home NPA Toll Calls”
NANPA NPA Database field definitions · checked October 13, 2026
[12] In NANPA's field definitions, 1+10D stands for 1 + 10 digits.
“1+10D - one plus ten digits”
NANPA NPA Database field definitions · checked October 13, 2026
[13] NANPA's database points to Planning Letter PL-507 for a map of 858.
“MAP: 507”
NANPA NPA Database (file dated October 13, 2026) · checked October 13, 2026
[14] NANPA's rate center report puts all 19 of 858's rate centers in the San Diego-Cula Vista-Carlsbad, CA Metropolitan Statistical Area.
“San Diego-Cula Vista-Carlsbad, CA Metropolitan Statistical Area”
NANPA NPA Rate Center Report (created October 13, 2026) · data · checked October 13, 2026
[15] NANPA's rate center report lists 19 rate centers for 858.
“CAMPO; CHULA VISTA; CORONADO; DEL MAR; DULZURA; EL CAJON; HARBISON-ALPINE; JACUMBA; LA JOLLA; LA MESA; NATIONAL CITY; PINE VALLEY; POWAY; RANCHO BERNARDO; RANCHO PENASQUITOS”
NANPA NPA Rate Center Report (created October 13, 2026) · data · checked October 13, 2026
[16] California approved a boundary elimination overlay for 619 and 858.
“approved a boundary elimination overlay as the relief method for the 619 NPA”
NANPA Planning Letter PL-507 (May 18, 2017) · checked October 13, 2026
[17] NANPA describes the 619 and 858 area as the City of San Diego and the cities around it.
“The 619 and 858 NPAs generally serve the City of San Diego”
NANPA Planning Letter PL-507 (May 18, 2017) · checked October 13, 2026
[18] The area also takes in unincorporated parts of San Diego County.
“as well as unincorporated portions of San Diego County”
NANPA Planning Letter PL-507 (May 18, 2017) · checked October 13, 2026
[19] After the change, 619 and 858 serve the same places.
“The new 619-858 NPA Overlay will be an all-services overlay and will serve the same geographic areas currently served by the existing 619 and 858 NPAs.”
NANPA Planning Letter PL-507 (May 18, 2017) · checked October 13, 2026
[20] NANPA's glossary uses NPA, Numbering Plan Area, for an area code.
“Numbering Plan Area (Area Code)”
NANPA glossary · checked October 13, 2026