The 559 area code serves the central San Joaquin Valley of California, including Fresno, Visalia, and Clovis. Created in 1998, 559 covers the agricultural heartland of the state, from the valley floor to the gateways of the Sierra Nevada. If a 559 number has appeared on your caller ID, this guide explains where it comes from, how to dial it, and how to stay safe from spoofed calls.
Quick Summary: Area Code 559 at a Glance
| Detail | Information |
|---|---|
| Area Code | 559 |
| State | California (CA) |
| Major Cities | Fresno, Visalia, Clovis, Hanford |
| Time Zone | Pacific Time (PT) |
| Country Code | +1 (USA) |
| Overlay Codes | None (single area code) |
Geographic Coverage & Major Cities
Area code 559 covers the central San Joaquin Valley, spanning Fresno, Kings, Tulare, and Madera counties along with parts of the surrounding region. It stretches from the flat, productive farmland of the valley to the foothills leading up to Sequoia and Kings Canyon National Parks.
Cities and communities served by the 559 area code include:
- Fresno — the valley’s largest city and a major agricultural and commercial center
- Clovis — the fast-growing suburb adjoining Fresno
- Visalia and Tulare — Tulare County hubs
- Hanford, Madera, and Selma — surrounding valley communities
Because it covers the heart of California’s Central Valley, a 559 number carries a distinctly regional identity for residents and businesses.
A Brief History of Area Code 559
Area code 559 was created in 1998, split from 209 as California’s Central Valley demand for numbers grew. The split kept 209 for the northern valley (Stockton and Modesto) and assigned 559 to the central valley around Fresno. To date, 559 has remained a single area code without an overlay, though 10-digit dialing is now standard across California.
Time Zone & Best Time to Call
Numbers in the 559 area code use Pacific Time (PT). The region observes Daylight Saving Time, shifting from PST (UTC−8) to PDT (UTC−7) between March and November each year.
How to Dial Phone Numbers in Area Code 559
Ten-digit dialing is now standard throughout California, so always include the area code.
Calling within the United States or Canada
- 10-digit dialing: Dial the full number — 559-XXX-XXXX.
- 11-digit dialing: You can also dial 1-559-XXX-XXXX; the leading 1 is the NANP country code.
Calling from outside the United States
- Format: [exit code] + 1 + 559 + XXX + XXXX
- From the UK, Europe, or most of Asia/Africa: 00 1 559 XXX XXXX
- From any mobile phone worldwide: +1 559 XXX XXXX
Is Area Code 559 a Scam? Safety & Protection Tips
Area code 559 is a legitimate California area code — a call from it is not fraudulent by default. However, scammers frequently spoof the code, faking the caller ID so their number appears to come from a trusted local Central Valley line. Neighbor spoofing, which mimics your own number’s first six digits, is especially common.
Common scam tactics linked to this region
| Scam type | What to watch for |
|---|---|
| Government impersonation | Callers posing as the IRS or SSA threatening arrest or fines |
| Utility shut-off threats | Demands for immediate payment to avoid disconnection |
| Agricultural & employment scams | Fake job offers requesting fees or personal information |
| Bank & card fraud alerts | Claims of “suspicious activity” seeking your account details |
How to report, block, and look up 559 callers
- Never share personal or financial details with an unexpected caller, however urgent they sound.
- Block the number using your phone’s built-in call-blocking feature or a reputable call-screening app.
- Look up the number with a trusted reverse phone lookup before returning any call.
- Report it to the FTC at reportfraud.ftc.gov and register at DoNotCall.gov.
Nearby & Related Area Codes in California
Area code 559 borders several other California codes:
- 209 — the northern San Joaquin Valley (Stockton, Modesto), 559’s parent code
- 661 — Bakersfield and the southern valley
- 408 — San Jose and Silicon Valley to the west (see our 408 area code guide)
- 760 — the eastern deserts and Sierra region (see our 760 area code guide)
Explore more codes across the state on our California area codes hub, or browse every prefix in our US area codes directory.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border California:
Frequently Asked Questions About Area Code 559
Where is the 559 area code located?
Area code 559 covers the central San Joaquin Valley of California, including Fresno, Visalia, Clovis, and Hanford. It operates on Pacific Time.
Is 559 a landline or cell phone area code?
Both. Area code 559 serves landlines, mobile phones, and VoIP numbers throughout the central Central Valley.
Does 559 have an overlay area code?
No. 559 remains a single area code without an overlay, though 10-digit dialing is now standard statewide.
Should I answer a call from an unknown 559 number?
If you are not expecting the call, let it go to voicemail. Legitimate callers leave a message, while spoofed or robocall numbers usually will not. Verify any unfamiliar number with a reverse lookup before calling back.
Related 559 Guides
- Is a 559 call safe? Read Is area code 559 a scam? Spam & safety guide.
- Local coverage: see the Fresno area code guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.