Area Code 623

About Area Code 623

Area code 623 is a geographic telephone area code assigned to Glendale, Arizona. It operates in the Mountain time zone and was first introduced in 1999. Split from 602. Western Phoenix metro.

Within Arizona, area code 623 shares numbering capacity with 4 other area codes. The state's 7,431,344-person population (2023 Census Bureau estimate) is served by a combined 5 active codes, with 623 primarily responsible for the Glendale region. Arizona's state capital is Phoenix, and its largest city is Phoenix.

When you receive a call from a 623 number on your Caller ID, the call originated from a phone number assigned to the 623 area code — but be aware that Local Number Portability (in effect since 2003) means the caller could be physically located anywhere in the US or Canada. Area code 623 only confirms where the number was originally assigned.

Where is the 623 area code located?

Area code 623 is assigned to Glendale, Arizona, in the Mountain time zone. The state of Arizona uses 5 active area codes, and 623 is one of them. Calls placed from the 623 area code originate from numbers assigned by NANPA — the North American Numbering Plan Administrator — and the 623 prefix appears on Caller ID for both landline and wireless calls placed from this region.

The Mountain time zone observes Daylight Saving Time, shifting from UTC-7 to UTC-6 in summer. The local time shown above is always current, so you can quickly check whether it's a reasonable hour to call back.

What cities and counties use the 623 area code?

The 623 area code serves 10 notable cities, listed below in order of population. The largest city in the 623 territory is Glendale (248,715 residents in Maricopa County).

• Glendale, AZ — 248,715 residents (5.9% of 623 numbers)
• Phoenix, AZ — 1,608,139 residents (38% of 623 numbers)
• Tucson, AZ — 542,629 residents (12.8% of 623 numbers)
• Mesa, AZ — 511,648 residents (12.1% of 623 numbers)
• Chandler, AZ — 279,458 residents (6.6% of 623 numbers)
• Gilbert, AZ — 275,346 residents (6.5% of 623 numbers)
• Scottsdale, AZ — 242,753 residents (5.7% of 623 numbers)
• Peoria, AZ — 190,985 residents (4.5% of 623 numbers)
• Tempe, AZ — 184,118 residents (4.4% of 623 numbers)
• Surprise, AZ — 143,228 residents (3.4% of 623 numbers)

Phone number format in area code 623

All phone numbers within area code 623 follow the standard North American 10-digit format:(623) NXX-XXXX. The NXX is the central office prefix (also called an "exchange") and XXXX is the subscriber line number. For long-distance calls within the NANP, dial 1 + 623 + NXX + XXXX. From outside North America, dial your country's international access code, then 1 (the NANP country code), then the 10-digit number.

If you need to verify whether a specific 623 number is wireless, landline, or VoIP, you can use our reverse phone lookup tool. Be aware that number portability means the area code no longer guarantees the caller's physical location — only where the number was first assigned.

History of area code 623

Split from 602. Western Phoenix metro.

The original 86 area codes were assigned by AT&T and Bell Labs in 1947 as part of the North American Numbering Plan. At the time, rotary-dial phones meant codes with lower digits (like 212 for NYC, 213 for LA, 312 for Chicago) were given to the largest cities because they took less time to dial. Today's area code assignments still reflect those early choices, even though touch-tone and cell phones made the original reason obsolete.

Is the 623 area code safe to answer?

Area code 623 itself is a normal geographic code with no elevated spam risk. That said, scammers can spoof any area code — including 623 — so if you don't recognize the full number, let it go to voicemail and verify the caller's identity before calling back.