Area Code 520

Arizona

Area code 520 serves Arizona, primarily Tucson, in the Mountain Time (MT) time zone. It was created from a split of area code 602.

Split Area Code

This area code was created by splitting an existing area code into separate geographic regions. When a split occurs, some customers in the original area code region are assigned the new area code.

This area code was split from area code 602 (Phoenix).

This area code was later split into area code 928 (Peoria).

In service since: 19-Mar-1995

Learn more about overlay and split area codes →

Demographics & Economics

Total Population: 1,737,891
Population Density: 79 people/sq mi
below U.S. average (U.S.: 93 people/sq mi)
Median Household Income: $67,929
near U.S. median (U.S.: $75,144)
Poverty Rate: 13.8%
above U.S. average (U.S.: 11.5%)
Unemployment Rate: 6.0%
above U.S. average (U.S.: 3.6%)
Education Attainment: Bachelor's Degree+
31.9%
near U.S. average (U.S.: 33.7%)
High School or Lower
28.0%

Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.

See how this area code compares to all US area codes in the income ranking and density ranking.

Time Zone

Mountain Time (MT)

NANPA Relief Status

According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.

Source: NANPA NPA Relief Planning Reports · See all relief planning statuses

Current Time

Mountain Time (MT)

Prefix Utilization

Geographic Coverage

State

Major Cities

Tucson
Goodyear
Avondale
Casas Adobes
Maricopa
Casa Grande
Marana
Catalina Foothills
Oro Valley
Sierra Vista
Sahuarita
Drexel Heights
Florence
Rio Rico
Green Valley
Nogales
Flowing Wells
Eloy
Douglas
Vail
Tanque Verde
Coolidge
Sierra Vista Southeast
Valencia West

and 110 more cities

Area Code 520 geographic coverage map (light mode)

Demographics

The estimated population served by area code 520 is approximately 1,737,891. The population density is 79 people per square mile, which is lower than the national average of 93. The median household income is $67,929, which is near the national median of $75,144. Approximately 31.9% of adults hold a bachelor's degree or higher, compared to the national rate of 33.7%. This rate is near the national average. The poverty rate stands at 13.8%, which is higher than the national rate of 11.5%.

History

Area code 520 was created from a split of area code 602. It was introduced in 1995 as part of a geographic division to provide additional numbering resources. Over time, area code area code 928 was split from 520.

County Coverage

Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 520).

County	Population	Share
Pima, AZ	1,073,726	61.8%
Pinal, AZ	367,953	21.2%
Cochise, AZ	120,011	6.9%
Maricopa, AZ	99,259	5.7%
Santa Cruz, AZ	74,699	4.3%
Gila, AZ	2,243	0.1%

Area Code 520 Family Tree

View All Trees

Hover over nodes to see details. Click to navigate to individual area code pages. Use scroll to zoom, drag to pan.

Total Codes

Splits

Overlays

Max Depth

All Descendants

Code ▲	State	Type	In Service	Parent
928	AZ	split	23-Jun-2001	520

Area code 520 was originally assigned in 19-Mar-1995 to serve AZ. Over the years, it has generated 1 descendant area code through a combination of geographic splits and overlays as demand for telephone numbers grew.