Area Code 559

California

Area code 559 serves California, primarily Fresno, in the Pacific Time (PT) time zone. It has served the region since 14-Nov-1998.

Overlay Area Code

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 357 (Fresno).

In service since: 14-Nov-1998

Learn more about overlay and split area codes →

Demographics & Economics

Total Population: 2,193,325
Population Density: 113 people/sq mi
above U.S. average (U.S.: 93 people/sq mi)
Median Household Income: $71,434
near U.S. median (U.S.: $75,144)
Poverty Rate: 18.2%
above U.S. average (U.S.: 11.5%)
Unemployment Rate: 8.9%
above U.S. average (U.S.: 3.6%)
Education Attainment: Bachelor's Degree+
19.7%
below U.S. average (U.S.: 33.7%)
High School or Lower
38.6%

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 Statistics dashboard.

Time Zone

Pacific Time (PT)

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

Pacific Time (PT)

Prefix Utilization

Geographic Coverage

State

Major Cities

Fresno
Visalia
Clovis
Tulare
Madera
Porterville
Hanford
Lemoore
Sanger
Reedley
Dinuba
Selma
Corcoran
Chowchilla
Coalinga
Kerman
Parlier
Avenal
Kingsburg
Lindsay
Mendota
Farmersville
Exeter
Madera Acres

and 108 more cities

Area Code 559 geographic coverage map (light mode)

Demographics

The estimated population served by area code 559 is approximately 2,193,325. The population density is 113 people per square mile, which is higher than the national average of 93. The median household income is $71,434, which is near the national median of $75,144. Approximately 19.7% of adults hold a bachelor's degree or higher, compared to the national rate of 33.7%. This rate is lower than the national average. The poverty rate stands at 18.2%, which is higher than the national rate of 11.5%.

History

Area code 559 was established in 1998 as a geographic area code. It shares its territory with area code area code 357.

County Coverage

Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 559).

County	Population	Share
Fresno, CA	1,039,739	47.4%
Tulare, CA	614,270	28.0%
Kings, CA	257,271	11.7%
Madera, CA	213,113	9.7%
Merced, CA	24,088	1.1%
Monterey, CA	18,975	0.9%
San Benito, CA	18,975	0.9%
Mariposa, CA	2,566	0.1%
Kern, CA	2,527	0.1%
Inyo, CA	1,801	0.1%

Area Code 559 Family Tree

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Total Codes

Splits

Overlays

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All Descendants

Code ▲	State	Type	In Service	Parent
357	CA	overlay	26-Mar-2025	559

Area code 559 was originally assigned in 14-Nov-1998 to serve CA. Over the years, it has generated 1 descendant area code through a combination of geographic splits and overlays as demand for telephone numbers grew.