The 623 area code covers the same area as 602, including Phoenix in Arizona.
Area code 623 is in Arizona, on Mountain Time, no daylight saving. In the 623 area, phone numbers are given out in Maricopa County. It has been in service since March 1, 1999. 480 and 602 cover the same area, so two neighbours can have different area codes.
- Where
- Maricopa County, Arizona
- Time zone
- Mountain Time, no daylight saving
- In service since
- March 1, 1999
- Shares its area with
- 480 (since 1999) and 602 (since 1947)
- Prefixes in use
- 312
- How to dial
- Local calls need all 10 digits: 623-555-0142.
Find out who called you from a 623 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (623) number is on today, use our free carrier lookup.
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Phoenix holds every phone prefix in area code 623.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 312 prefixes in use shows where 623 numbers are actually given out.
- Phoenix312 prefixes, 100%
Qwest (Lumen) holds the most phone number prefixes in area code 623: 97 of 312.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 312 prefixes in use in 623 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| Qwest (Lumen)Lumen's landline company | 97 | 31% |
| T-MobileMobile network | 39 | 13% |
| AT&T MobilityMobile network | 22 | 7% |
| Level 3 (Lumen)Lumen's business and wholesale network | 12 | 4% |
| Comcast (Xfinity)Cable company's phone service | 11 | 4% |
| Teleport (AT&T)AT&T's business phone network | 9 | 3% |
| 20 other carriers | 122 | 39% |
72% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
623 started in 1999 as an overlay on 602, and its ground has not changed since.
1999
623 starts on March 1, 1999, as an overlay on 602: new numbers on the same ground.
A 623 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 623 are 520, 928 and 702.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
These are the questions people ask most about area code 623.
Where is area code 623?
623 covers Phoenix in Arizona. In the 623 area, phone numbers are given out in Maricopa County.
What state is area code 623 in?
Arizona. 623 is an Arizona area code on Mountain Time, no daylight saving.
Which phone company owns area code 623?
No single phone company owns 623. NANPA's records show Qwest (Lumen) holds the most 623 prefixes, 97 of 312, followed by T-Mobile and AT&T Mobility. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 623 in?
623 is on Mountain Time, no daylight saving.
When did area code 623 start?
623 went into service on March 1, 1999, as an overlay on 602: new numbers for the same area.
Is 623 the same area as 480 and 602?
Yes. 480 (since 1999) and 602 (since 1947) cover the same ground as 623. Nobody's number changed when they were added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 623 number?
Local calls need all 10 digits: 623-555-0142.
Is 623 a toll-free number?
No. 623 is a regular area code for Phoenix in Arizona, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 623?
The closest are 520 (Tucson, Arizona), 928 (Yuma, Arizona) and 702/725 (Las Vegas, Nevada), measured between the centres of each area.
Who called me from a 623 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 623 a scam?
623 is a real Arizona area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.