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.

Published: February 17, 2026Verified against NANPA and FCC records

Split Area Code

This area code exists because its parent region ran low on available numbers: the parent territory was divided geographically, this code took over one part of it, and the parent kept serving the rest. Existing customers generally keep their numbers — only the code changes for the newly drawn region.

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

Its original territory was later further divided: 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: 80 people/sq mi
below U.S. average (U.S.: 95 people/sq mi)
Median Household Income: $70,315
below U.S. median (U.S.: $80,734)
Poverty Rate: 13.8%
above U.S. average (U.S.: 12.5%)
Unemployment Rate: 6.0%
above U.S. average (U.S.: 5.2%)
Education Attainment: Bachelor's Degree+
32.5%
near U.S. average (U.S.: 35.7%)
High School or Lower
27.6%

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 80 people per square mile, which is lower than the national average of 95. The median household income is $70,315, which is lower than the national median of $80,734. Approximately 32.5% of adults hold a bachelor's degree or higher, compared to the national rate of 35.7%. This rate is near the national average. The poverty rate stands at 13.8%, which is higher than the national rate of 12.5%.

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

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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.