The 623 area code serves the West Valley of metropolitan Phoenix, including Glendale, Peoria, Surprise, and Goodyear. Created in 1999 when it split from 602, 623 covers the rapidly expanding western suburbs of the Valley of the Sun.
Quick Summary of the 623 Area Code
| Area Code | 623 |
| State | Arizona (AZ) |
| Region | West Valley (Glendale, Peoria & Surprise) |
| Major Cities | Glendale, Peoria, Surprise, Goodyear, Avondale, Buckeye, Sun City, El Mirage |
| Time Zone | Mountain Standard Time (MST) – no daylight saving |
| Dialing Format | 7 or 10-digit dialing |
Geographic Coverage
The 623 area code covers the western side of the Phoenix metro, including the sports-and-entertainment city of Glendale, Peoria and Surprise to the northwest, the Southwest Valley cities of Goodyear, Avondale, and Buckeye, the retirement community of Sun City, and El Mirage. It sits west of the 602 Phoenix core.
Time Zone
The 623 area code observes Mountain Standard Time (MST, UTC−7), but Arizona is unusual: it does not observe daylight saving time and keeps the same clock all year. This produces an interesting effect – in winter the region is on Mountain Time, one hour ahead of the West Coast, but in summer, when other states spring forward and Arizona does not, the 623 area effectively matches Pacific Daylight Time and shares the same clock as California.
Tip: Business hours across the 623 region generally run 9:00 AM to 5:00 PM local time, Monday through Friday.
How to Dial a 623 Number
Area code 623 is not part of an overlay, so it has traditionally allowed 7-digit local dialing. However, 10-digit dialing is now the recommended nationwide standard, and dialing the full 10-digit number (623 + the line number) always works reliably. For international callers, dial your country’s exit code, then +1 (the North American country code), then 623, followed by the seven-digit local number.
Scam Alerts for the 623 Area Code
Like every U.S. area code, 623 has been used by scammers who spoof local numbers to appear trustworthy. Residents in Glendale, Peoria, Surprise, Goodyear, Avondale, Buckeye, Sun City, El Mirage should stay alert to the following common tactics:
| Scam Type | What to Watch For |
|---|---|
| IRS / Tax Scams | Callers impersonating the IRS and threatening arrest over supposed unpaid taxes. |
| Utility Shut-off | Fake APS or SRP callers demanding instant payment to keep your power on in the heat. |
| Medicare / Health Scam | Robocalls targeting Sun City retirees seeking Medicare numbers for free braces or test kits. |
| Prize / Lottery Scam | Calls saying you won a prize but must pay a “fee” or “tax” to claim it. |
If you receive a suspicious call from a 623 number, take these steps to protect yourself:
- Do not share personal information such as Social Security numbers, bank details, or passwords over the phone.
- Hang up and verify by calling the organization back using an official number from its website.
- Report the call to the FTC at reportfraud.ftc.gov and to the Arizona Attorney General’s Office.
- Block the number and consider registering with the National Do Not Call Registry.
Red Flag: Legitimate agencies such as the IRS, Social Security Administration, or your local utility company (APS, SRP, or Tucson Electric Power) will never demand immediate payment by gift card, wire transfer, or cryptocurrency. Any 623 caller making such a demand is a scammer.
History and Economy of the 623 Region
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Area code 623 was created in 1999, split from 602, to serve the fast-growing West Valley of Phoenix. The regional economy blends sports, aerospace, logistics, and retirement living. Glendale is a major sports and entertainment destination, home to State Farm Stadium and Desert Diamond Arena, hosting the Arizona Cardinals and numerous marquee events. Luke Air Force Base near Glendale is a major fighter-pilot training installation and economic anchor, while Goodyear and Buckeye – one of the fastest-growing cities in the nation – have drawn large manufacturing and distribution operations, and Sun City remains a landmark active-retirement community.
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Looking Up a 623 Number
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To identify a 623 caller, use a reverse phone lookup or search the full 10-digit number online. Businesses, sports venues, and government offices across the West Valley publish their 623 numbers widely, so a legitimate caller is often easy to confirm with a quick search. For unknown numbers, let the call go to voicemail – genuine callers usually leave a message.
Nearby & Related Area Codes
Arizona is served by several area codes. If you are researching 623, these neighboring codes are worth knowing:
- 602 – Central Phoenix
- 480 – East Valley / Scottsdale & Mesa
- 928 – Northern & Western AZ / Flagstaff
- 520 – Southern AZ / Tucson
You can also browse our full directory of Arizona area codes for more regional guides.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border Arizona:
- California – area code 213
- Nevada – area code 702
- Utah – area code 801
- Colorado – area code 303
- New Mexico – area code 505
Frequently Asked Questions
Where is the 623 area code located?
The 623 area code covers the West Valley of metro Phoenix, including Glendale, Peoria, Surprise, Goodyear, Avondale, Buckeye, Sun City, and El Mirage.
Does 623 have an overlay?
No. The 623 area code covers the West Valley on its own and currently has no overlay code.
Do I need to dial 10 digits for 623?
Because 623 has no overlay, 7-digit local dialing has historically worked, but dialing the full 10 digits is now the recommended standard and always works.
Does the 623 area code observe daylight saving time?
No. Like almost all of Arizona, the 623 area stays on Mountain Standard Time year-round and does not change its clocks.
Related 623 Guides
- Is a 623 call safe? Read Is area code 623 a scam? Spam & safety guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.