Area code 559

Area code 559 at a glance

Area code 559 is a geographic area code in California, in service since November 14, 1998, according to the North American Numbering Plan Administrator (NANPA). It is an overlay: 559 and 357 cover the same territory, so neighbors on the same street can have different area codes. It is in the Pacific time zone. The places with the most assigned exchanges include Fresno, Visalia, Clovis, Madera, and Hanford. By population, its largest named places are Fresno, Modesto, Visalia, Clovis, and Tulare.

Cities and towns in area code 559

559 holds 3.6% of the 22,087 central office codes assigned in California, the 10th most of the state's 41 codes. 29 Census places could be matched to rate centers with 559 exchanges; the most populous are Fresno (550,000), Modesto (221,000), Visalia (146,000), and Clovis (128,000). Each place page lists the exact prefixes and carriers for that town.

How calls are dialed in 559

According to NANPA's dialing-plan data, local calls within 559 are dialed as 1 plus ten digits and toll calls as 1 plus ten digits. Because local calls need the area code, business cards, signage and website copy should always show the full ten-digit number. NANPA's dialing-plan note for this code reads: "10-digit dialing permissible at wireless providers discretion"

Carriers with 559 numbers

47 carriers hold the 785 central office codes assigned in 559. Pacific Bell has the most, with 182 (23%). 620 of the codes (79%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. The code holder is not necessarily the carrier serving a given number today, since numbers can be ported between providers.

Rate centers and towns in 559

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 559 has codes in 60 rate centers. Rate center names in the file are abbreviations; where one matches a Census place, the table links to that city's local-number page.

559 code assignments over time

An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 785 are assigned in 559, 98% of 800. 125 were assigned in 2020 or later.

Using area code 559 for business calls

Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.

Porting a number you already use in area code 559 is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.