619 Area Code: San Diego, 858 Overlay & History

The essentials

619 area code: quick facts

How 619 became San Diego's code

The CPUC traces southern California numbering back to 213, which it says originally covered all of southern California. 714 was created from it, and 619 was later split from 714. The timeline below uses the CPUC and the FCC.

1. 1982: Area code 619 is created as a geographic split of the 714 area code, according to the CPUC. The FCC lists 619 as opening in January 1982.
2. March 1997: The 760 area code is split off 619. The FCC lists 760 as opening in March 1997.
3. 1998: The numbering administrator (NANPA) determines that 619 is running short of numbers and submits a relief plan with two three-way geographic split options, according to a CPUC report from 2001. The 858 code was the first phase of that three-way split; the CPUC report says the second phase was deferred.
4. June 1999: The 858 area code is split off 619. The FCC lists 858 as opening in June 1999.
5. October 4 and 5, 2016: Public meetings are held in San Diego, Solana Beach, and Pine Valley before the application is filed. The CPUC decision records 14 comments received.
6. December 15, 2016: NANPA, for the telecommunications industry, files Application 16-12-005 asking the CPUC to approve a boundary elimination overlay for 619 and 858.
7. April 27, 2017: The CPUC issues Decision 17-04-027 approving the boundary elimination overlay.
8. May 19, 2018: Dialing 1 + area code + number becomes mandatory for all calls to and from 619 and 858 numbers.
9. June 19, 2018: New lines in the former 619 region may be assigned 858 numbers, and new lines in the former 858 region may be assigned 619 numbers.

Where area code 619 is used

The CPUC says the 619 area code principally serves the southern portion of the City of San Diego and the adjacent cities of Chula Vista, Coronado, El Cajon, Imperial Beach, La Mesa, Lemon Grove, National City, and Santee, plus unincorporated areas of San Diego County. Its 2017 decision describes the City of San Diego as the state's second most populated city, with over 1.3 million people.

The decision counts eleven rate centers in the 619 area, six of which serve the City of San Diego. It adds that 619 is bordered on the north by 858, on the east by the 760/442 overlay, on the west by the Pacific Ocean, and on the south by Mexico. During the 2016 public meetings a commenter pointed out that Otay Mesa and San Ysidro are the only South Bay communities with the 858 area code. That is a public comment recorded by the CPUC, not a regulator finding, so confirm a specific address with your phone provider before you assume its area code.

Because of the 2018 change, a 619 number no longer says where in the region it was first issued. See the section on the boundary elimination below.

Why 619 needed relief, and why a boundary elimination was chosen

An area code has a limited supply of three-digit prefixes. The CPUC says that thousand-block number pooling and other conservation measures, begun in 1999, stretched the life of both 619 and 858 for many years. By 2017 the CPUC said those measures had run their course.

NANPA's forecasts then moved. The October 2015 forecast showed 619 exhausting in the first quarter of 2019. The October 2016 forecast moved that to the fourth quarter of 2018. The CPUC's Communications Division reviewed the data and agreed with the fourth quarter of 2018. A May 2017 CPUC news release says 619 was expected to use up its prefixes by March 2019, so the regulator's own documents give slightly different timing.

The industry presented two options. Alternative 1 removed the boundary between 619 and 858. Alternative 2 added a new all-services overlay code over the 619 area only. The CPUC chose Alternative 1 because it avoided opening a new area code and gave San Diego one dialing pattern. The decision says 858 was forecast to last beyond thirty years, and that combining the two would give a projected life of approximately 17 years.

Neighboring area codes in California

The CPUC decision names the codes that touch 619. The table shows what the official sources say about each.

The 858 boundary elimination and what it changes

The CPUC calls the 2018 change a boundary elimination overlay. It says this "effectively undoes a previous area code split" and combines the areas of two area codes into a single geographic area served by both. Unlike a traditional overlay, no new code was added.

• Existing numbers: all 619 and 858 customers kept their phone numbers.
• Local calls stay local: the CPUC says the new dialing procedure does not change the cost of a call, and that calls in a local calling area remain local calls.
• Who had to change dialing: customers with 619 and with 858 numbers, because 7-digit dialing within the home area code ended.
• When both codes are assigned: from June 19, 2018, new lines in the former 619 region may get 858 numbers and the reverse. The decision says providers that already hold blocks of 858 numbers keep assigning those first-come, first-served.

Time zone and daylight saving time

Area code 619 uses Pacific Time. The tz database zone table lists the zone America/Los_Angeles with the label "Pacific." It lists a different zone, America/Tijuana, for Baja California, Mexico, which borders the 619 region on the south but is not part of it.

Daylight saving time starts at 2:00 a.m. on the second Sunday of March and ends at 2:00 a.m. on the first Sunday of November. The NIST page says these rules were enacted by the Energy Policy Act of 2005. In 2026, NIST gives March 8 and November 1 as the change dates.

How to dial a 619 number

North American numbers have three parts: a country code, a three-digit area code, and a seven-digit local number. NANPA says the ITU assigned country code 1 to the NANP area.

The CPUC says that since May 19, 2018, every call to or from a 619 or 858 number must be dialed as 1 plus the area code plus the telephone number. This includes calls within the same area code that once needed only seven digits. A call dialed another way is not completed, and a recording tells the caller to hang up and dial again. You can still dial three digits for 911, 211, 311, 411, 511, 611, 711, and 811 where they are available. The CPUC dialing material is from 2017 and 2018, so confirm the current rule with your provider.

The CPUC advises reprogramming automatic dialing equipment, and lists life safety systems, fax machines, Internet dial-up numbers, alarm and security systems, gates, speed dialers, call forwarding settings, and voicemail services.

Caller ID and scams with a 619 number

The FTC warns that "Scammers can make any name or number show up on your caller ID." The FTC calls this spoofing. Scammers can also match the first six digits of your own number, which the FTC calls neighbor spoofing.

• If you pick up and do not recognize the caller, the FTC advises that you hang up.
• The FTC says an unknown call can also go to voicemail.
• The FTC says call blocking is your best defense against unwanted calls.

A 619 number shows the code that was assigned, not who is calling or where they are. The sources checked do not say that 619 numbers are targeted more than other codes. Because 619 and 858 now serve the same region, neither code is a reliable sign of where in San Diego a caller is.

Business numbers in the 619 area

Since June 19, 2018, a new line in the San Diego region may carry either 619 or 858, and carriers may assign unassigned numbers from either code. The CPUC decision says that as one code nears exhaustion, carriers will eventually obtain new numbers only from the other. Which code a new line gets depends on the provider's inventory, so ask before you plan a campaign or print a number on materials.

Because the two codes cover the same region, route calls by team or extension, not by area code. A caller with a 619 or an 858 number could be anywhere in the combined area, and a business in the northern part of the city may well hold a 619 number.

Important: Whether a specific 619 number can be assigned to your business depends on your phone provider and its current inventory. This guide does not make claims about availability.

Before you use a 619 number

• Confirm the number is available from your provider, and get its terms in writing.
• Ask who owns the number and whether it can be moved to another provider if you switch.
• Ask whether a new line would be a 619 or an 858 number.
• Dial 1 plus the area code plus the number on every system, including PBXs, fax machines, alarms, gates, call forwarding, and voicemail.
• Print the full number, with area code, on stationery, cards, and advertising.
• Route calls by team or extension, because 619 and 858 share one region.
• Check each site's address. The CPUC names cities, not street boundaries, so confirm the address with your provider.
• Plan for caller ID. A 619 number does not prove who is calling, and neighbor spoofing copies the first six digits of your own number.

Related guides and tools

• 213 area code guide: Los Angeles, another California code, for comparison with San Diego.
• 415 area code guide: San Francisco, a California code with its own overlay history.
• Browse all U.S. area code guides, including codes that do not have their own guide yet.
• Business phone system and call routing for local numbers in San Diego.

Frequently asked questions