Area code 738
Where the 738 area code is, its overlay and how to dial a +1 738 number from anywhere.
The 738 area code is in California, United States (Pacific (PT)). To call from abroad: +1 738 555-0123. It is an overlay, so all 10 digits are dialled.
The 738 area code is a geographic North American Numbering Plan (NANP) code covering California. It has been in service since 16-Mar-2023 and sits in the Pacific (PT) time zone.
How to dial a 738 number
+1 738 555-01231 738 555-0123738 555-0123Other California area codes
Frequently asked questions
Where is the 738 area code?
The 738 area code is in California, United States (Pacific (PT)).
Is 738 an overlay area code?
Yes. 738 overlays the same region as 213, 323, so callers dial all 10 digits.
Do I have to dial 10 digits for 738?
Yes — dial the area code plus the seven-digit number.
How do I call a 738 number from another country?
Dial your exit code (or +), then 1, then 738, then the number: +1 738 555-0123.
Source: NANPA numbering plan. An area code covers a region, not a precise address — a 738 number does not pinpoint a street or ZIP code.
Missed a call from +1 738?
In the 30 days to September 24, 2026, 14 unwanted calls showing a 738 number were reported to the US Federal Trade Commission, 79% of them recorded messages or robocalls. That puts 738 at #401 of 670 area codes reported.
- If you do not know anyone in California, do not call back: a genuine caller will leave a message or send a text.
- Scammers fake the number shown on caller ID, so a 738 number can hide a caller anywhere in the world.
- Never give a code received by text or a bank detail to an unknown caller. In the US, calls can be reported at reportfraud.ftc.gov.
Who issues +1 738 numbers
Phone companies hold blocks of numbers in each area code. The main holders in 738:
About 5% of the 40 prefixes in use belong to mobile carriers: a 738 number is often a cell phone, and it may have moved to another carrier since.
Sources: FTC Do Not Call reported calls (numbers as reported by consumers, not verified), NANPA central office code assignments.
All US area codes United States +1 Map of area code 738 — cities & rate centres