Area Code for San Diego

San Diego County is served by four area codes: 619, 858, 760, and 442 — covering everything from Downtown’s Gaslamp Quarter to the desert border with Mexico, and north through the biotech corridor at La Jolla all the way to Oceanside’s Camp Pendleton.

619 is the original code, established in 1982. It covers central and southern San Diego — Downtown, Chula Vista, El Cajon, Coronado, and the South Bay cities. It carries the deepest cultural identity: the Navy, the Padres, the Zoo, the border. 858 split off in 1999 to serve the tech-heavy northwest corridor — La Jolla, UTC, Sorrento Valley, Mira Mesa — and became the identifier for biotech and defense contractors. 760 handles North County and an enormous inland desert region stretching to the Nevada line, with overlay 442 added in 2009.

What’s the area code for San Diego?

The table below covers all four codes you will encounter when calling to or from San Diego County.

Code	Established	Coverage	Notes
619	1982	Central/south San Diego city, South Bay, East County	Original SD code; overlay with 858 since 2019
858	1999	La Jolla, UTC, Sorrento Valley, Del Mar, Poway, Rancho Bernardo	Tech/biotech corridor; overlay with 619 since 2019
760	1997	North County, East County, inland deserts, Imperial Valley	46,666 sq mi — ~29% of CA land area
442	2009	Overlay on all 760 territory	Same geography as 760; new lines may get either code

The 619/858 overlay means that since 2019, both codes cover the same geography across San Diego city proper. New lines in San Diego city may receive either code. Ten-digit local dialing is mandatory across all four codes.

San Diego area codes by region

Downtown, South Bay, East County: 619

Area code 619 covers the historic heart of San Diego. Downtown’s Gaslamp Quarter, Little Italy, Old Town, and Balboa Park all sit in 619 territory. South along the bay: National City, Chula Vista, Imperial Beach, and Coronado. East through the valleys: La Mesa, El Cajon, Lemon Grove, and Santee.

For a 619 area code number, expect the strongest local identity signal — 619 is how San Diegans identify their city to the outside world. The Naval Base San Diego and Naval Air Station North Island (Coronado) both operate in 619, cementing its association with the city’s military backbone.

La Jolla, UTC, Sorrento Valley, Mira Mesa: 858

Area code 858 covers the northwest arc of San Diego city and the immediate northern suburbs. Key neighborhoods: La Jolla, University City (UTC), Sorrento Valley, Mira Mesa, Carmel Valley, and Scripps Ranch. Suburbs: Del Mar, Solana Beach, Poway, Rancho Bernardo, and Rancho Santa Fe.

This is 858 area code territory — the research and innovation corridor. UCSD sits in La Jolla (858). The Torrey Pines Science Park biotech cluster runs on 858 numbers. The Sorrento Valley tech campus, home to dozens of defense contractors and semiconductor firms, is firmly 858.

North County: 760 / 442

Area code 760 covers coastal North County and the inland valleys. In San Diego County: Carlsbad, Oceanside, Encinitas, Vista, San Marcos, Escondido, Ramona, Fallbrook, Borrego Springs, and Julian.

Camp Pendleton — the largest Marine Corps base on the West Coast, housing roughly 40,000 active-duty personnel — sits in the 760 zone north of Oceanside. Beyond the county line, 760 area code extends across eastern Riverside, the High Desert, all of Imperial County (El Centro, Calexico, Brawley), and north through Inyo and Mono Counties. At 46,666 square miles, 760 is one of the largest area code footprints in the contiguous United States.

Overlay 442 went live November 21, 2009 and covers the identical territory. New lines in the region may receive either code.

History of San Diego area codes

San Diego’s area code history tracks the city’s transformation from a mid-sized Navy town into a major metropolitan economy.

1947 — The North American Numbering Plan launches. California receives three codes: 415 (Northern CA), 916 (Central Valley), and 213 for everything else — Los Angeles, San Diego, and the entire southern half of the state. See NANPA for the full NANP history.

1982 — Southern California’s explosive growth forces 213’s first major relief. Area code 619 splits off from 714 (not 213 — Southern CA had already reorganized by this point) on January 1, 1982, taking San Diego, Imperial County, and a stretch of desert east to the Nevada border.

1997 — 619 is exhausting numbers. Area code 760 splits off on March 22, 1997, taking North County San Diego, the Inland Empire desert communities, and the entire vast interior — roughly 46,666 square miles. San Diego city retains 619.

1998–1999 — NANPA determines that 619 itself is again approaching exhaustion. The CPUC approves a three-way geographic split. Area code 858 goes live on June 12, 1999, taking the northwest San Diego corridor: La Jolla, Del Mar, Poway, Rancho Bernardo, Rancho Santa Fe, Linda Vista, and Mira Mesa. This is confirmed in the CPUC 858 area code report.

2009 — 760 numbers grow scarce. The CPUC approves overlay 442, which activates November 21, 2009 on top of all 760 territory.

2019 — The CPUC formalizes 619 and 858 as a full all-services overlay. The geographic boundary between the two codes is eliminated. All new numbers in San Diego city may be assigned either code, and 10-digit local dialing becomes mandatory throughout the overlay area.

Current projections: San Diego will not require additional area code relief until approximately 2043, according to Wikipedia’s NANPA data.

619 vs 858: San Diego’s identity divide

If you know San Diego, you know that 619 and 858 carry different identities — even though the CPUC erased the geographic line between them in 2019.

619 is the native San Diego code. It predates 858 by 17 years and carries the city’s history in its digits. The Navy’s Pacific Fleet is 619. The San Diego Zoo is 619. Petco Park is in the Gaslamp Quarter — 619. Sempra Energy and Jack in the Box, two of the city’s largest headquartered companies, operate from Downtown addresses that are firmly 619.

The cultural weight is explicit. Rey Mysterio, the professional wrestler and San Diego native, named his finishing move “The 619” after his home area code. NFL running back Reggie Bush famously wore “619” in his eye black to honor his city. Neither tribute would have landed the same with 858.

858 became San Diego’s tech and biotech identifier almost immediately after launch. Qualcomm — which invented CDMA technology and whose chips power most of the world’s smartphones — is headquartered in Sorrento Valley, firmly 858 territory. Illumina, the genomics giant, operates from La Jolla (858). ResMed (sleep apnea devices) and General Atomics (defense drones and nuclear technology) are both 858 companies. UCSD’s research park in La Jolla, Torrey Pines Genomics Institute, and Scripps Research all run on 858.

The 619 vs 858 divide maps roughly to what New Yorkers mean by 212 vs 646: the original code signals roots, and the split code signals a specific industry cluster. For a tech startup wanting to signal La Jolla or Sorrento Valley, 858 carries more precision than 619.

San Diego area code spam and scams

San Diego’s geography creates specific scam patterns that other metros do not face. Three categories stand out.

Border impersonation scams (619/760): San Ysidro — in 619 territory — is the world’s busiest land border crossing, handling 70,000 northbound vehicles and 20,000 pedestrians daily. Scammers exploit this context with fake CBP (Customs and Border Protection) and DHS calls claiming the target faces immigration enforcement, detention, or fines. The CBP has issued multiple public warnings about spoofed CBP phone numbers used in these campaigns.

Military impersonation scams (619/760): San Diego is the most military-concentrated metro in the United States. Defense generates $61.3 billion in regional economic output — 22.2% of the metro’s gross regional product. Scammers targeting this population spoof military command numbers and official DoD lines, demanding fees for benefits processing, deployment status changes, or emergency wire transfers.

Biotech investment fraud (858): The 858 corridor’s biotech reputation makes it a target for investment fraud scripts. Callers claim affiliation with UCSD spinouts, La Jolla genomics firms, or Sorrento Valley defense contractors to sell fake pre-IPO shares or “exclusive biotech investment opportunities.” The 858 code lends surface credibility.

Across all three codes, neighbor spoofing is common: the scammer’s dialer matches the first six digits of your own number so the call appears local. The FCC’s spoofing and caller ID guide explains the mechanics.

STIR/SHAKEN (Secure Telephone Identity Revisited / Signature-based Handling of Asserted information using toKENs) is the FCC-mandated framework that combats spoofing. Carriers assign each call an attestation level: A-attestation means the originating carrier has verified the calling party is authorized to use that number. Numbers provisioned through compliant registered US carriers carry A-attestation, so your outbound calls display as verified on recipient phones rather than as “Spam Risk.” Read our full explainer at STIR/SHAKEN glossary.

How to get a San Diego business phone number

You do not need a San Diego office to get a 619, 858, or 760 number. Cloud VoIP providers provision numbers in minutes regardless of your location.

1. Choose your target code. Match the code to your market: 619 for Downtown, South Bay, or East County presence; 858 for tech/biotech/La Jolla credibility; 760 or 442 for North County clients in Carlsbad, Oceanside, or Escondido.
2. Sign up with a VoIP provider. Go to DialPhone pricing and select a plan. Business plans include unlimited domestic calling.
3. Select your San Diego number. During setup, search available numbers by area code. Inventory updates in real time — if 619 numbers are scarce, the 619/858 overlay means 858 reaches the same territory.
4. Port your existing number if needed. If you already have a SD number with another carrier, you can transfer it in. Typical port time for 619/858 numbers is 2–5 business days. See the number porting guide for the full paperwork checklist.
5. Activate and test. Your new SD number is live instantly. Outbound calls carry STIR/SHAKEN A-attestation from day one — your caller ID displays as verified, not “Spam Risk.”

Start with a free trial — no credit card required, San Diego number included.

Famous companies in San Diego area codes

San Diego’s area codes appear in the corporate identity of companies that define entire industries.

858 — Tech and biotech corridor: Qualcomm (5775 Morehouse Dr., Sorrento Valley) is the defining 858 company — the semiconductor and wireless technology firm whose CDMA patents underpin global mobile networks. Illumina (5200 Illumina Way, La Jolla) is the dominant force in DNA sequencing equipment.

ResMed (9001 Spectrum Center Blvd., Rancho Bernardo) makes the sleep apnea devices used by millions worldwide. General Atomics (3550 General Atomics Ct., La Jolla) builds the Predator and Reaper drones used by the US military. Neurocrine Biosciences and Halozyme Therapeutics are among the dozens of clinical-stage biotech companies headquartered in La Jolla and Torrey Pines under 858.

619 — Downtown and South Bay: Petco is headquartered in Downtown San Diego (619) — the pet supply giant that also lends its name to Petco Park, home of the Padres. Sempra Energy (488 8th Ave., Downtown) is the Fortune 500 utility parent of Southern California Gas and San Diego Gas & Electric.

Jack in the Box, founded in San Diego in 1951, carries its corporate identity from the city’s 619 roots. The Naval Base San Diego on Harbor Drive is the largest surface combatant fleet concentration on the US West Coast — a 619 institution.

760 — North County: Callaway Golf (2180 Rutherford Rd., Carlsbad) designs its clubs from North County. Cobra Golf, Taylor Made, and Acushnet (Titleist/FootJoy) all have major Carlsbad facilities — making the 760 corridor a de facto golf industry cluster.

San Diego area code FAQ

San Diego area code FAQ

What is the area code for San Diego? +

San Diego County uses four area codes: 619, 858, 760, and 442. Area code 619 is the original code covering central and southern San Diego, including Downtown, Chula Vista, and El Cajon.

Area code 858 was split from 619 in 1999 and covers the northern city corridor — La Jolla, UTC, Sorrento Valley, and Mira Mesa. In 2019 the CPUC formalized 619 and 858 as a full overlay, meaning both now serve the same geography in San Diego city proper.

Area code 760 covers North County (Carlsbad, Oceanside, Escondido, Encinitas) and a vast inland desert region. Its overlay, 442, was added in 2009 when 760 numbers grew scarce.

What is the difference between area codes 619 and 858? +

619 is San Diego's original code — it predates 858 by 17 years and carries a stronger cultural identity with Downtown, the Gaslamp Quarter, Coronado, and the South Bay. It is associated with the city's military, maritime, and civic heritage.

858 was created in 1999 specifically to serve the tech-heavy northern corridor: La Jolla (UCSD, Scripps Research), Sorrento Valley, UTC, and Mira Mesa. It became the biotech and defense-contractor identifier — Qualcomm, Illumina, ResMed, and General Atomics all operate in 858 territory.

Since the 2019 overlay, the geographic boundary is gone. Both codes cover the same territory in San Diego city, but the identity signal persists: 619 = native San Diego, 858 = tech/biotech corridor.

What cities are in the 760 area code? +

Area code 760 covers a massive swath of California — roughly 46,666 square miles, about 29% of the state's total land area. In San Diego County it serves North County and East County: Carlsbad, Oceanside, Escondido, Encinitas, Vista, San Marcos, Ramona, Fallbrook, and Julian.

Outside San Diego County, 760 extends into eastern Riverside County, eastern San Bernardino County (Victorville, Barstow), all of Imperial County (El Centro, Calexico), Inyo County, and Mono County. Its overlay, 442, was activated November 21, 2009, and new lines in the region may be assigned either code.

When did San Diego get the 858 area code? +

Area code 858 went live on June 12, 1999, as the first phase of a three-way geographic split of the 619 numbering plan area. The North American Numbering Plan Administrator (NANPA) had determined in 1998 that 619 was approaching number exhaustion, and the California Public Utilities Commission approved the split.

858 took over the northwest San Diego corridor — Del Mar, La Jolla, Poway, Rancho Bernardo, Rancho Santa Fe, Linda Vista, and Mira Mesa — while 619 retained central and southern San Diego. The boundary between the two codes was formally eliminated in 2019, making them a full overlay.

Are 619 and 858 calls scams? +

Not automatically, but both codes are heavily spoofed. Common patterns in San Diego include CBP/DHS impersonation calls targeting border-area residents with fake immigration enforcement threats, military impersonation scams leveraging San Diego's large Navy and Marine presence, and neighbor spoofing where the first six digits of your own number are faked.

STIR/SHAKEN call authentication — mandated by the FCC for all US carriers — assigns an attestation level to each call. An A-attestation means the originating carrier has verified the calling party is authorized to use that number. Numbers provisioned through compliant carriers carry A-attestation, so your outbound calls display as verified rather than 'Spam Risk.' See the FCC's spoofing guide for more detail.

Do I need a San Diego area code to do business there? +

You do not need a physical San Diego office to get a 619, 858, or 760 number. Cloud VoIP providers provision local numbers in minutes regardless of your location. A local number improves answer rates — studies consistently show callers are more likely to pick up numbers matching their area code.

For a downtown presence, choose 619. For a tech-sector or La Jolla identity, choose 858. For North County (Carlsbad, Oceanside, Escondido), choose 760 or 442. All can be provisioned with STIR/SHAKEN A-attestation so your caller ID displays cleanly.

What is the 442 area code? +

Area code 442 is the all-services overlay for the 760 region, activated November 21, 2009. The California Public Utilities Commission approved it after NANPA projected that 760 numbers would exhaust within a few years.

Like all overlays, 442 covers the same geography as 760 — North County San Diego, eastern Riverside, the High Desert, Imperial Valley, and beyond. New lines in the region may be assigned either 760 or 442. The codes are operationally identical; the difference is simply when the number was assigned.

How do I get a San Diego business phone number? +

Getting a San Diego business number is a five-minute process with a cloud VoIP provider. Choose your target code (619 for downtown/south, 858 for tech corridor, 760/442 for North County), sign up for a plan, and select from available numbers — inventory updates in real time.

No physical San Diego office is required. Port an existing number if you already have one — typical port time for 619/858 numbers is 2–5 business days. Your new line comes with STIR/SHAKEN A-attestation from day one, so outbound calls display as verified to recipients.

Get a San Diego business number

A local San Diego number takes minutes to set up — no physical office, no long-term contract on entry-level plans.

• Start a free trial and claim your 619, 858, or 760 number today.
• Compare plans at DialPhone pricing.
• Add AI call answering with DialPhone AI Receptionist — handles after-hours calls, takes messages, and routes callers using your SD number as the display line.
• Already have a San Diego number? Port it in — typical timeline is 2–5 business days for 619/858.
• Add business phone features: call recording, IVR, voicemail transcription, and team extensions — all on your local SD number.

Related: 619 area code · 858 area code · 760 area code · all California area codes