Area Code 623: Get a Glendale Phone Number

623 · Glendale

What is the area code for Glendale?

The area code for Glendale, Arizona is 623, with overlay code 602 sharing the same geographic footprint. The 623 area code is a North American Numbering Plan geographic code assigned in 1999, covering the West Valley Phoenix Metro region. It serves approximately 1,500,000 residents on the Mountain Time (MT) (UTC-7).

The 623 area code has 310 assigned central-office prefixes (NXX codes, the three digits after the area code) across 1 rate center, with numbers allocated to roughly 31 carriers.

At 310 of the ~792 usable central-office prefixes, the 623 area code has about 39% of its numbering capacity assigned, and that near-exhaustion is part of why overlay code 602 was added to the region. See how 623 compares in our NXX prefix allocation analysis across 338 US area codes. (Prefix data: localcallingguide.com / NANPA, 2026.)

Where is area code 623? Location and map area

Area code 623 is located in Arizona, the United States. Its coverage area centers on Glendale and spans the West Valley Phoenix Metro region. If you received a call from a 623 number, the caller's number was assigned in this area — though with number porting and virtual numbers, the person may be calling from anywhere.

The 623 location sits in Mountain Time (MT), so local business hours run roughly 9 a.m.–5 p.m. MT. Neighboring Arizona area codes include 480, 520, 602.

All Phoenix area codes

Phoenix is served by 2 area codes across the metro area. 623 is the 1999 addition; the others were added as overlays or for surrounding suburbs.

• 602 — Phoenix — 1947 original
• 623 (current page) — Overlay on the same metro, assigned 1999

Cities served by the 623 area code

The 623 area code covers 5 major cities and towns across the West Valley Phoenix Metro region (AZ):

Businesses across Glendale and surrounding cities use 623 numbers to project local presence and lift call answer rates. Industry studies of local presence dialing consistently report answer-rate gains of 20–40% over toll-free or out-of-area numbers — a caller ID that matches the recipient's region looks familiar and gets picked up.

623 area code time zone and business hours

The 623 area code is in the Mountain Time (MT) zone (UTC-7). Standard business hours in 623 run 9 AM to 5 PM MT.

If you're calling into 623 from a different time zone, factor in the offset. For example, an Eastern Time business calling 623 at 9 AM ET reaches Glendale at 7 AM MT — likely outside standard business hours.

History of the 623 area code

The 623 area code was introduced in 1999 when the North American Numbering Plan was first deployed. As Glendale grew and number demand increased, overlay code 602 was added to serve the same geographic region — a common solution that avoids forcing existing subscribers to change their numbers.

• 1947 602 added to serve the same region
• 1999 623 entered service

Is the 623 area code safe? Spam and scam calls

623 is a legitimate geographic area code for Glendale — it is not a scam code or a premium-rate prefix, and a call from a 623 number is most likely a genuine local caller. The risk is not the area code itself but a tactic called neighbor spoofing: scammers fake their caller ID so an unwanted call appears to come from your own area code, because people answer familiar numbers more readily.

If you get an unexpected 623 call, a few signals point to a likely scam — a pre-recorded message, urgent pressure to act now, a demand for payment by gift card or wire transfer, or anyone asking for passwords, Social Security, or account numbers. Let suspicious calls go to voicemail, never share personal information, and report fraud to the FTC at reportfraud.ftc.gov.

The FCC consumer guide on spoofing explains your rights under the Truth in Caller ID Act. A real Glendale business will leave a clear voicemail and will not pressure you.

US carriers verify caller ID with the STIR/SHAKEN framework, which flags many spoofed numbers as "Spam Likely" before they ring. DialPhone 623 numbers are registered for STIR/SHAKEN attestation, so calls from your business are verified as genuine and reach customers without a false spam label. See the DialPhone guide to VoIP security for more.

Why get a 623 area code number for your business?

Getting a 623 number gives your business three measurable advantages over a toll-free or out-of-area number:

1. Local trust signal. Customers in Glendale recognize 623 as their home area code. Caller ID matching builds immediate credibility for service businesses, sales outreach, and patient communication.
2. Higher answer rate. Calls from a familiar local area code are answered far more often than unknown or toll-free numbers — industry measurements of local presence dialing put the lift at 20–40%, which matters most for outbound sales, appointment confirmations, and time-sensitive service callbacks.
3. Targeted marketing. Businesses serving Glendale and the broader West Valley Phoenix Metro can advertise a local number across print, radio, billboards, and digital channels for higher conversion than a national 800 number.

For businesses in Glendale and surrounding cities, top industries that benefit from local 623 presence include Professional Services, Healthcare, and Retail. DialPhone's AI receptionist is available for every 623 number — never miss a call, even after standard business hours.

How to get a 623 area code number

Setting up a 623 business number with DialPhone takes under 10 minutes:

1. Sign up for a DialPhone plan. Choose any plan starting at $24/user/month. Free 14-day trial, no credit card required.
2. Search available 623 numbers. Filter the DialPhone number inventory by area code, city, or pattern.
3. Choose your number and configure. Assign your new 623 number to a user or team, set up call routing, voicemail, AI receptionist, and business SMS.
4. Port your existing number (optional). Already have a 623 number? Free number porting in 2 to 5 business days with zero service interruption.

New to local numbers? The complete guide to getting a local phone number covers choosing the right area code, porting an existing line, and avoiding spam flags.

623 area code overlay codes

The West Valley Phoenix Metro region is served by multiple overlay area codes:

Area Code	Coverage
623	Primary area code for West Valley Phoenix Metro, assigned 1999
602	Overlay — same geography (assigned 1947)

All overlay codes serve the same Glendale region. New subscribers may be assigned any available code; existing numbers retain their original prefix.

AI receptionist for 623 area code businesses

Every DialPhone 623 number includes optional AI receptionist coverage, available 24/7. The AI handles calls when your team is unavailable — answering common questions, booking appointments, routing urgent callers to on-call staff, and capturing voicemail with full transcription and intent tagging.

For businesses in Glendale that handle high call volume, run extended hours, or need bilingual support (especially valuable in service areas with diverse customer bases), the AI receptionist reduces voicemail backlog and improves first-call resolution.

All area codes in Arizona

Arizona has 5 active geographic area codes. The 623 area code is part of the same numbering plan as the codes listed below — calls between them are typically local within the state, depending on the carrier.

Nearby area codes

Related area codes in Arizona and the Mountain Time (MT) region:

• 480 area code — Scottsdale, Arizona
• 520 area code — Tucson, Arizona
• 602 area code — Phoenix, Arizona
• 928 area code — Flagstaff, Arizona
• 208 area code — Boise, Idaho
• 303 area code — Denver, Colorado

All Arizona area codes → · Browse all US area codes →

More area codes: ← 621 Houston · 626 Pasadena →

How this page is verified

DialPhone re-verifies every area code page every 90 days. Area code geography, timezone, and overlay data come from the official North American Numbering Plan Administration (NANPA) database. Pricing reflects the published DialPhone plan tiers — see the pricing page for current details. Number availability varies; check the DialPhone signup flow for live inventory in the 623 region.

What to know before getting a 623 number

• Number availability is finite. Popular Glendale area codes can be inventory-constrained — request specific vanity patterns early.
• Porting timing varies. Most 623 ports complete in 2-5 business days; complex multi-line legacy contracts can take 7-10.
• HIPAA tier required for healthcare. The Core $24 plan doesn't include a BAA — healthcare users need Advanced ($34) or above.