Area Code 442 — San Diego, California

NANP area code

442

UTC−8, UTC−7 during daylight saving

State
California
Primary city
San Diego
Time zone
Pacific
In service
2009
Overlay
760

The code reaches 120 communities and 7 counties across California.

Was this call legitimate?

The area code itself carries no risk signal. 442 is assigned to San Diego, California, so a call from it is consistent with a real caller in that area — but the digits alone prove nothing, because they can be forged.

Caller ID is set by whoever places the call, not verified by the network. That is why neighbour spoofing works: an operation anywhere in the world can display a number that matches the area code — and often the first three digits after it — of the person being called, so the call looks local. Every community in the 442 territory is a plausible-looking origin for a forged 442 number, which is why one can be made to look like a neighbour to so many people. The same applies to its overlay code 760, which serves the same ground.

If you did not recognise the call: let it go to voicemail — a legitimate caller with real business will leave one. Do not return the call using the number shown; look the organisation up independently and call the number you found. Never confirm personal details, card numbers, or one-time codes to someone who called you, however plausible the number looked.

Codes.zone publishes no complaint counts, risk scores, or caller identities. We hold no data on individual numbers and will not estimate what we cannot source.

Local time and when to call back

Time there now

Pacific · UTC−8, UTC−7 during daylight saving

Reasonable callback window

8:00 AM – 9:00 PM

local time in Pacific

Federal rules bar telemarketing calls to a residence outside 8:00 AM–9:00 PM in the called party's own time zone. It is a sensible bound for a personal callback too — and a caller who rang you well outside it was not observing it.

Overlay codes and ten-digit dialling

442 does not have its territory to itself. 760 covers the same ground, serving San Diego and the rest of the 442 territory. An overlay is what a regulator adds when a region runs out of assignable numbers: rather than splitting the area and forcing half the residents to change their number, a second code is laid over the top and new numbers are issued from it.

The practical consequence: two neighbours on the same street can hold numbers in different area codes, so the code tells you nothing about which part of town a caller is in — and local calls must be dialled as all ten digits, because seven is no longer unambiguous.

Cities served

largest 20 by ZIP count
Communities served by area code 442, ranked by how many ZIP codes each holds.
CityZIP codesCounty
San Diego76San Diego County
Escondido7San Diego County
Oceanside7San Diego County
Carlsbad6San Diego County
Palm Desert4Riverside County
San Marcos4San Diego County
Victorville4San Bernardino County
Vista4San Diego County
Hesperia3San Bernardino County
Indio3Riverside County
La Quinta3Riverside County
Palm Springs3Riverside County
Apple Valley2San Bernardino County
Barstow2San Bernardino County
Bishop2Inyo County
Blythe2Riverside County
Boron2Kern County
Calexico2Imperial County
California City2Kern County
Cathedral City2Riverside County

100 further communities not listed. All California area codes →

Each point is a community served by 442, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.
  • Reference points and footprint
  • Not an official NANPA boundary
  • Not a USPS delivery area

Scope every community matched to 442. Source geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot), GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . Coordinates are place reference points, not boundaries.

Counties

Prefixes inside 442

We do not publish the NXX prefixes inside 442. The assignment of prefixes to rate centres comes from LERG routing data, which is proprietary, and we will not estimate it from postal data — ZIP codes and telephone prefixes do not map onto each other. Awaiting a clean-rights NPA-NXX source.

Why this code exists

442 is the newer code here, added in 2009 over 760 (1997). The older code had run out of exchanges to assign, and an overlay avoids the alternative — splitting the region and forcing half its residents to renumber. New lines have been issued from 442 since.