Area Code 623
Arizona
Area code 623 serves Arizona, primarily Phoenix, in the Mountain Time (MT) time zone. It is an overlay area code sharing territory with area code 602.
Overlay Area Codes
This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.
This area code shares its geographic region with: area code 480 (Phoenix), area code 602 (Phoenix).
In service since: 01-Mar-1999
History
Area code 623 serves as an overlay for the same territory as area code 602. It was introduced in 1999 to provide additional phone number capacity for the region. It shares its territory with area codes area code 480 and area code 602.
Demographics
The estimated population served by area code 623 is approximately 1,550,200. The population density is 488 people per square mile, which is higher than the national average of 94. The median household income is $85,518, which is near the national median of $78,538. Approximately 35.9% of adults hold a bachelor's degree or higher, compared to the national rate of 35.0%. This rate is near the national average. The poverty rate stands at 11.3%, which is near the national rate of 12.4%.
Demographics & Economics
- Total Population
- 1,550,200
- Population Density
- 488 people/sq miabove U.S. average (U.S.: 94 people/sq mi)
- Median Household Income
- $85,518near U.S. median (U.S.: $78,538)
- Poverty Rate
- 11.3%near U.S. average (U.S.: 12.4%)
- Unemployment Rate
- 4.6%below U.S. average (U.S.: 5.2%)
- Education Attainment
- Bachelor's Degree+35.9%near U.S. average (U.S.: 35.0%)High School or Lower26.8%
Statistics are population-weighted aggregations from Census ACS 5-year estimates.See Sources for details.
Geographic Coverage
State
AZ
Major Cities
- Phoenix
- Mesa
- Chandler
- Gilbert
- Glendale
- Scottsdale
- Peoria
- Tempe
- Surprise
- San Tan Valley
- Goodyear
- Buckeye
- Avondale
- Queen Creek
- Apache Junction
- El Mirage
- Sun City West
- Fountain Hills
- Anthem
- New River
- Sun Lakes
- Paradise Valley
- Gold Canyon
- Tolleson
and 19 more cities
Time Zone
- Mountain Time (MT)
Current Time
County Coverage
Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 623).
| County | Population | Share |
|---|---|---|
| Maricopa, AZ | 1,550,200 | 100.0% |
Call Context
This area code covers a metropolitan region in AZ with moderate to high population density, centered on Phoenix and surrounding communities.
Nearby Area Codes
Area codes geographically closest to 623.
Other Area Codes in Arizona
Area codes that also serve Arizona, linked for easy comparison.
Frequently Asked Questions
Common questions about area code 623 and how phone numbering works.
Phone numbers assigned to area code 623 are tied to where they were originally provisioned — not the caller's current location. This code serving roughly 1550k people covers Phoenix in AZ, so a number originally set up there will retain the 623 prefix even if the owner moves or uses VoIP. Mobile phones keep their original number when users relocate, and businesses often adopt local area codes to establish a regional presence.
Start by looking up the area code on this site to understand its geographic context — area code 623 is associated with Phoenix in AZ. For caller-specific details, use your carrier's caller ID features or check public directories. If you suspect fraud, you can report it to the FTC. To file a complaint about robocalls or spoofed numbers, visit the FCC Consumer Complaint Center. You can also register with the National Do Not Call Registry.
When an area's available number pool runs low, regulators introduce an "overlay" code covering the same territory. Both codes coexist, and new numbers are assigned from whichever has availability. Area code 623 serves the Phoenix region in AZ, where growing demand for phone numbers necessitated an additional code. This area code shares its region with area code 602, area code 480. Learn more in our overlay vs split guide.