What is the 623 Area Code? Time Zone and Location
- Area code 623 serves Phoenix, AZ and the surrounding areas — it is an overlay for area code 602 and serves the same area
- Area code 623 is part of an overlay complex with area codes 480 and 602 covering the same Phoenix metropolitan geography — combined, this overlay complex serves a population of 4,656,777
- The 623 area code primarily covers the northwestern suburbs of Phoenix — the West Valley — encompassing cities including Glendale, Peoria, Surprise, Avondale, Goodyear, Sun City, Sun City West, El Mirage, Buckeye, Tolleson, Cashion, Youngtown, Litchfield Park, and Wittmann
- The 623 area code is located in the Mountain Standard Time (MST) zone — following UTC−7 year-round — Arizona does not observe Daylight Saving Time, so the time remains consistent throughout the year
- Area code 623 was put into service on March 1, 1999 and was the 252nd area code in service — one of 23 area codes introduced in 1999 — created to relieve the pressure on the 602 area code as numbers in 602 were being exhausted by Phoenix's explosive growth
- In 2021, the Arizona Corporation Commission converted the 602, 480, and 623 numbering plan areas into an overlay complex for the entire Phoenix area by removing NPA boundaries in 2023 — making 10-digit dialing mandatory across the Valley
- 10-digit dialing mandatory for all local calls within the 480/602/623 overlay complex
Glendale, AZ (623 Area Code)
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Open this region in Google MapsQuick Facts
| Area Code | 623 |
|---|---|
| Country | United States |
| State / Region | Arizona (West Valley — western Phoenix metropolitan area) |
| Area Code Type | Overlay area code (shares region with area codes 480 and 602) |
| Overlay Codes | 480, 602 |
| Major Cities Covered | Glendale, Peoria, Surprise, Avondale, Goodyear, Sun City, Sun City West, El Mirage, Buckeye, Tolleson, Cashion, Youngtown, Litchfield Park, Wittmann, Morristown, Tonopah, Arlington, Gila Bend, Wickenburg (partial) |
| Primary City Association | Glendale, Arizona (largest city fully within 623's original West Valley footprint) |
| Geographic Coverage | 21 cities across 2 counties in the western Phoenix metropolitan area — primarily Maricopa County — spanning the full breadth of the West Valley from Glendale and Peoria in the north to Goodyear and Buckeye in the southwest |
| Time Zone | Mountain Standard Time (MST) — no Daylight Saving Time observed |
| Standard Time Offset | UTC −7 hours year-round |
| Daylight Saving Time | Not observed — Arizona remains on MST throughout the year |
| Introduced / Activation Date | March 1, 1999 — the 252nd area code in service and the 3rd area code in Arizona |
| Reason for Creation | Created in 1999 as a split from the 602 area code — at the same time as 480 was created for the East Valley — as Phoenix's extraordinary population growth exhausted available numbers in 602 |
| Dialing Requirement | 10-digit dialing mandatory across the entire Phoenix Valley since the 2023 boundary elimination overlay |
| Coverage Nature | Overlay complex — 480, 602, and 623 all share the same Phoenix metropolitan geography with no boundaries between them since 2023 |
| Population Coverage | Combined with overlays 480 and 602, serves a population of 4,656,777 across the Phoenix metro area |
| Nearby / Related Area Codes | 480 (East Valley Phoenix suburbs), 520 (Tucson/Southern AZ), 602 (central Phoenix), 928 (Flagstaff/Prescott/Rural AZ) |
| Telecom System | North American Numbering Plan (NANP) |
| Example Phone Format | (623) XXX-XXXX |
| Usage Type | Mobile, landline, VoIP numbers — with Arizona residents among the highest wireless-only usage rates in the nation at 64.9% |
| Business Use | Highly valuable for local presence across the West Valley — one of the fastest-growing residential and commercial corridors in the United States |
| Number Availability | By the early 2020s, 480 and 602 were facing exhaustion within the decade, but 623 continued to have hundreds of unassigned central office codes and was not expected to exhaust for the foreseeable future — making it the most number-available of the three Phoenix metro codes |
| Area Code Status | Active and growing |
| No DST Advantage | Arizona's permanent MST time zone means no biannual clock changes — during summer, Arizona aligns with Pacific Daylight Time (UTC−7), making it easier for businesses to coordinate with West Coast partners without seasonal schedule disruptions |
| Notable Geography | The West Valley is home to State Farm Stadium (home of the Arizona Cardinals and Super Bowl host), Desert Diamond Arena (formerly Gila River Arena, home of the Arizona Coyotes), and the massive Sun City and Sun City West retirement communities — one of the largest retirement populations of any US area code |
Is the 623 Area Code a Scam?
| Robocall Volume | The West Valley's 623 area code generated 6.8 million scam robocalls in a single month — ranking #6 nationally for robocall volume, ahead of the iconic 602 code and part of a statewide pattern that makes Arizona a national leader in robocall activity |
|---|---|
| Spam Growth | Spam calls in Arizona increased by 212.23% over the past year — one of the sharpest statewide increases in the country — with the highest volume recorded in August 2025 accounting for 13.1% of all calls, and prerecorded voice accounting for 38.6% of all reported Arizona calls |
| Top Reported Cities for Complaints | Phoenix, AZ leads with 14.63% of complaints, followed by Surprise, AZ (10.96%), Glendale, AZ (5.39%), Peoria, AZ (5.06%) |
| Common Labels | Violent real estate cold caller, American Express impersonator, APS/SRP utility disconnection fraudster, SSA arrest threat robocaller, fake lawsuit filer |
| Spoofing Risk | The Phoenix metro overlap makes 623 interchangeable with 602 and 480 for spoofing purposes — fraudsters have another local-looking Phoenix option to display on caller ID, lending calls an identical sense of local origin to West Valley residents |
| "Retirement Community" Exploitation | The West Valley's large retirement population — particularly in Sun City and Sun City West — makes 623 a prime target for Medicare, Social Security, and financial fraud, as retirees are statistically more likely to answer unknown calls and more vulnerable to authority impersonation scams |
| Typical Strategy | Neighbor spoofing — appearing as a familiar Glendale, Peoria, or Surprise number to build trust among West Valley residents before making real estate harassment, American Express fraud, or utility disconnection demands |
| Signature Scam — Violent Real Estate Cash Offer Harassment | People using names like "Steve," "Julio Osuna," "Michelle," or "Dan" call or text unsolicited cash offers for your home — claiming to be from companies like "Always Yes Properties," lying that you previously spoke with a partner, offering to buy your home "as is" to create false urgency — and when you decline, escalating to extreme verbal abuse, obscenities, and direct violent threats against victims and their families, using personal information and your address to continue harassment |
| Signature Scam — American Express Callback Phishing | Scammers spoof 623 numbers and claim to be from American Express, providing a callback number that either doesn't work or connects to a fake agent who attempts to steal your full card number, expiration date, and security code under the pretense of "verifying" suspicious account activity |
| Signature Scam — APS/SRP Utility Disconnection | Scammers target Phoenix West Valley residents with APS (Arizona Public Service) and SRP (Salt River Project) impersonation calls — threatening to disconnect power within 30–45 minutes unless immediate payment is made by prepaid card, exploiting the extreme summer heat in Arizona where power disconnection is a life-threatening prospect for elderly residents |
| Signature Scam — SSA "Legal Enforcement Action" Robocall | Robocallers targeting the West Valley's large retiree population claim legal enforcement actions have been filed on their Social Security Number — threatening suspension of benefits or immediate arrest to frighten seniors into calling back and surrendering personal information or making payments |
| Reporting Authority | Report suspicious calls to the FTC at ReportFraud.ftc.gov, to the Arizona AG's Consumer Protection Division at azag.gov or 1-844-668-1331; for APS scams, call APS directly at 602-371-7171; for SRP scams, call 602-236-8888 |
| Key Risk Indicator | Unsolicited cash home offers that turn threatening when declined, American Express alerts with callback numbers that don't connect to real agents, APS/SRP disconnection calls demanding prepaid card payment in extreme summer heat, or SSA robocalls claiming pending legal enforcement actions |
| Safety Tip | Real estate professionals do not threaten violence when you decline their services — any caller who becomes abusive or threatening should be immediately blocked and reported to the Arizona AG. APS and SRP send written notices by mail long before disconnection and will never demand immediate gift card payment during a phone call |
What Are the Business Benefits of the 623 Area Code?
| Local Presence | A 623 number establishes immediate credibility across the West Valley — one of the fastest-growing residential and commercial corridors in the United States, home to major sports venues, large retirement communities, and a rapidly expanding suburban economy |
|---|---|
| Customer Trust Factor | A local Glendale, Peoria, or Surprise 623 number dramatically increases answer rates vs. unknown out-of-state numbers in a fast-growing market where new residents actively seek local service providers |
| Coverage Advantage | One number covers 21 cities across Maricopa County's West Valley — reaching the full breadth of Glendale, Peoria, Surprise, Avondale, Goodyear, Sun City, Buckeye, and surrounding communities |
| No DST Advantage | Arizona's permanent MST time zone means no biannual clock changes — businesses benefit from a consistent, predictable time offset for scheduling with national partners, and during summer months Arizona aligns with Pacific time making West Coast coordination seamless |
| VoIP Compatibility | Easily available for SaaS platforms, call centers, and remote teams serving the Phoenix West Valley market |
| Scalability | 623 has the most available central office codes of any Phoenix metro area code — with hundreds of unassigned prefixes not expected to exhaust for the foreseeable future — ensuring the strongest long-term number availability in the entire Phoenix overlay complex |
| Economic Profile | Maricopa County's 2026 population is estimated at 4,792,050 with a 1.09% annual growth rate — with a median household income of $80,675 and per capita income of $42,341 — making the West Valley one of the most economically dynamic and fast-growing suburban markets in the Southwest |
| Marketing Use | Ideal for local SEO, digital ads, and customer outreach across Glendale, Peoria, Surprise, Avondale, Goodyear, Sun City, El Mirage, Buckeye, Tolleson, Litchfield Park, and surrounding West Valley communities |
| Retirement Market Access | Sun City and Sun City West are among the largest and most established retirement communities in the United States — a 623 number is essential for healthcare providers, financial advisors, and senior services businesses targeting this significant and financially active demographic |
| Startup Friendly | Attractive for healthcare, construction tech, real estate, and solar energy startups given the West Valley's extraordinary residential growth rate, large retiree population, and Arizona's business-friendly regulatory environment |
| Call Routing Flexibility | Can route calls globally while appearing local to West Valley customers — particularly valuable for national retail, healthcare, and construction companies managing Phoenix metro operations |
| Top Industries | Healthcare (Banner Health West, Abrazo West Campus, Arrowhead Regional), sports and entertainment (State Farm Stadium — Arizona Cardinals, annual Super Bowl host; Desert Diamond Arena), retail and construction (one of the fastest-growing home construction markets in the US), senior living and retirement services, education (Grand Canyon University proximity, Glendale Community College), solar energy, and logistics benefit most from a local 623 presence |
| Use Case Examples | AI receptionist, healthcare practice and hospital network lines, senior living and retirement services, real estate agencies (rapidly growing West Valley market), sports and entertainment venue customer services, solar energy sales lines, construction and home services, logistics and distribution support, and local retail and hospitality businesses |