Fresno ZIP Codes: The Full List, and Why Two-Thirds Aren't Delivery Routes

All 58 ZIP codes USPS assigns to Fresno

Every one of the 58 ZIP codes USPS assigns to "Fresno, CA" as the primary place name sits inside Fresno County, per this site's source data. There's no county split here the way there is on this site's Denver or Atlanta lists. What the county-level view hides is how few of those 58 codes actually correspond to a residential mail route: zip-codes.com's own delivery-type tally for the city counts 19 standard codes, 28 PO Box codes, and 11 unique codes assigned to single high-volume recipients, meaning the codes that aren't tied to an ordinary carrier route outnumber the ones that are, by roughly two to one.

The 2010 split that created 93737

93737 is the newest code on the list above, and it exists because of a specific, documented USPS decision rather than a gradual boundary drift. The Postal Service's Sacramento District announced in mid-2010 that the 93727 ZIP, on Fresno's east side, had grown crowded enough to justify carving out a piece of it as its own code. The split took effect July 1, 2010, and only affected around 1,200 customers on the east side of Temperance Avenue, who received notice by mail that spring; the same Sunnyside postal station on East Olive Avenue kept handling their delivery afterward; only the ZIP printed on the envelope changed.

That's a narrower kind of change than the splits and overlays this site has documented at the area-code level (see the California area codes list for how Fresno's own area code, 559, split off a larger numbering plan area in 1998), but it follows the same underlying logic: when growth outpaces what a single code can carry efficiently, the agency responsible draws a new line rather than letting the old one strain indefinitely.

93844 and 93888: two ZIPs tied to an IRS center that closed in 2021

93844 and 93888 both stand out from the rest of the table above: neither is a delivery area anyone lives in, and zip-codes.com tags both as IRS Service Center codes among the 11 unique codes in its tally. They trace back to a paper tax-return processing center the IRS operated at Butler and Peach avenues on Fresno's east side (inside the same 93727 ZIP this article's earlier section covers), which employed roughly 3,000 people at its 2016 peak before the agency wound the site down and closed it permanently at the end of September 2021, as electronic filing displaced most paper returns. Taxpayers in the states the Fresno center used to serve (Alaska, California, Hawaii, Ohio, and Washington) now mail paper returns to the IRS's Ogden, Utah processing center instead, but the two Fresno ZIP codes remain in USPS's own database regardless.

This site's own Atlanta ZIP list already flags the same single-recipient pattern for Atlanta's 39901 and Austin's 73301, and for Chicago's 28 single-recipient codes: when an organization receives enough mail, USPS carves out a ZIP that belongs to it alone, wherever that number happens to fall in the numbering sequence. Fresno's pair is a reminder that a unique ZIP can keep existing in that database even after the facility it was built for has shut down.

From 209 to 559 to 357: Fresno's area codes, one of them barely a year old

Fresno's phone numbers trace back to 209, which itself split off from 916 (one of California's three original 1947 area codes) in 1958, decades before Fresno had a code of its own to call. Fresno kept 209 for four more decades before the region split off its own code, 559, in November 1998, the same year several other fast-growing California metros split off codes of their own. 559 stayed Fresno's only code for more than 26 years, longer than 213 lasted before Los Angeles's first split in 1951, before regulators added an overlay, 357, on March 26, 2025, among the newest area codes in the state, per Wikipedia's tracking of the numbering plan.

That overlay means new phone numbers in the Fresno area now carry 357 rather than 559, while existing 559 numbers keep working exactly as before, the same overlay pattern this site's California area codes list documents elsewhere in the state. San Francisco added its own overlay, 628, back in 2015, and Sacramento added 279 in 2018, both years ahead of Fresno's turn. Los Angeles's most recent overlay, 738, is the one that came close: it landed November 1, 2024, less than five months before 357 arrived in Fresno.