Arizona · Mountain Time
623 Area Code
Area code 623 is in Arizona, serving Phoenix and the greater Phoenix metro area (Valley of the Sun) in central Arizona. It is in the Mountain Time zone. It shares its territory with overlay codes 480 and 602, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 623 area code?
623 is a Arizona area code covering Phoenix and the greater Phoenix metro area (Valley of the Sun) in central Arizona. In the wider directory it sits in the West region.
Cities in the 623 area code
- Phoenix
- Mesa
- Chandler
- Glendale
- Scottsdale
- Gilbert
- Tempe
- Peoria
- Surprise
- Avondale
- Goodyear
- Buckeye
- Queen Creek
- Apache Junction
Counties served by 623
Maricopa County and Pinal County.
Time zone note: Arizona does not observe daylight saving time (except the Navajo Nation).
623 overlay codes and dialing
The 623 territory is covered by an overlay of 3 area codes: 480, 602, 623. All of them serve the same geographic area, and the original code is 602. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 623 area code
623 went into service on March 1, 1999 as an overlay of 602, relieving number exhaustion in the Phoenix area. Rather than splitting the region, the overlay lets existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 623 a scam or spam risk?
623 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 623 number on your screen is no guarantee the caller is in Phoenix, AZ or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Explore more
See every code in Arizona, compare codes across the West region, or view all Mountain Time codes. You can also browse the 6XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
623 area code FAQ
Where is the 623 area code?
The 623 area code is in Arizona, covering Phoenix and the greater Phoenix metro area (Valley of the Sun) in central Arizona, in the West region.
What cities are in the 623 area code?
Cities in the 623 area code include Phoenix, Mesa, Chandler, Glendale, Scottsdale, Gilbert, Tempe, Peoria, Surprise and Avondale.
What time zone is 623 in?
623 is in the Mountain Time zone. Arizona does not observe daylight saving time (except the Navajo Nation).
What is the overlay for the 623 area code?
623 shares its territory with 480 and 602. All 3 codes (480, 602, 623) serve the same area, so 10-digit dialing is required for every call.
When did the 623 area code start?
623 went into service on March 1, 1999 as an overlay of 602.
Do I have to dial 10 digits for 623?
Yes. Because 623 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 623 a toll-free or premium code?
No. 623 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.