The Inland Empire’s original number, the 909 area code blankets southwestern San Bernardino County — San Bernardino, Ontario, Rancho Cucamonga, Fontana, Chino — plus eastern Los Angeles County cities such as Pomona, Claremont, and Diamond Bar, with small pieces of Riverside and Orange counties at the edges. Live since November 14, 1992, when it was split from 714, its entire footprint has doubled up with the 840 overlay since February 23, 2021.
Unexpected calls bearing 909 or 840 digits are typically Inland Empire logistics at work — dispatchers, brokers, and recruiters covering the Ontario–Fontana warehouse belt — and the code, on its own, vouches for no one.
909 at a glance
| Quick fact | Answer |
|---|---|
| In service since | November 14, 1992 |
| Split from | 714 |
| Overlay | 840, in service February 23, 2021 |
| Territory anchors | San Bernardino, Ontario, Rancho Cucamonga, Fontana, Pomona |
| Dialing | 1 plus ten digits on every call |
| Exhaust projection | First quarter of 2056 (909/840 complex, April 2026 NANPA study) |
Few codes have been through as many relief plans as this one. California ordered 909 an overlay for 2001 that never launched, cut the code in half in 2004 instead, then finally overlaid it in 2021 — twenty years and one set of digits after the first attempt. The paper trail runs through five NANPA planning letters and two decades of regulatory second thoughts.
Four counties on one caller ID
NANPA’s Planning Letter PL-529 sketches the modern footprint: Big Bear City, Chino, Chino Hills, Colton, Fontana, Grand Terrace, Highland, Loma Linda, Montclair, Ontario, Rancho Cucamonga, Redlands, and Yucaipa on the San Bernardino County side, with Claremont, Diamond Bar, Industry, La Verne, Pomona, San Dimas, and Walnut across the Los Angeles County line — plus Calimesa and Eastvale in Riverside County and a small slice of Orange County.
Calimesa is the map’s best footnote. When the 2004 split moved the rest of Riverside County to a new code, the CPUC kept Calimesa in 909 because it shares a rate center with Yucaipa, Oak Glen, Forest Falls, and Angelus Oaks — and most of that rate center’s subscribers live on the San Bernardino side. Area code boundaries follow rate centers, not county lines; our NPA-NXX guide unpacks why.
The overlay that ran twenty years late
909 filled up fast. Created from 714 in 1992 to serve both Inland Empire counties, it was back in relief planning by decade’s end. The CPUC’s Decision 99-03-059 (March 18, 1999) approved a two-phase fix, published in NANPA’s Planning Letter PL-189 (August 26, 1999): phase one would split western Riverside County off as 951 in 2000; phase two would lay a second code — 752 — over everything that remained, in service February 10, 2001.
Neither phase happened. The commission’s December 16, 1999 order suspended the plan pending industry comment, and NANPA’s PL-215 (February 24, 2000) confirmed the freeze twelve days after permissive dialing was to have begun. A test number for 951 routing, 951-800-0951, had been live since January 8, 2000 — it was retired with nothing to test. The 752 overlay was never activated, and 951 itself, assigned on paper since April 1999, went back on the shelf.
The suspension stretched nearly four years while California wrung extra life out of the existing supply — the same statewide conservation bet that still keeps 650’s 764 overlay on the shelf. When the industry reconvened in May 2002 to redraw the options, NANPA projected 909’s prefixes gone by the fourth quarter of 2003, and the choice narrowed to two: an all-services overlay or a two-way geographic split.
Halved along the county line
In Decision 03-11-022 (November 13, 2003), the CPUC chose the split — its consumer surveys still favored keeping seven-digit dialing — and NANPA’s Planning Letter PL-334 (December 12, 2003), superseding PLs 189, 206, and 215, set the schedule. Permissive dialing began July 17, 2004; mandatory dialing followed October 30, 2004.
The north kept 909: San Bernardino, Ontario, Fontana, Rialto, Redlands, Chino, Upland, Pomona, Claremont, and the mountain communities from Crestline to Big Bear Lake. Everything south of the county line became 951, western Riverside County’s code — the number that had waited five years for a territory.
840 finally lands — thirteen days past the anniversary
The overlay idea returned once 909 alone neared exhaust again. CPUC Decision 19-06-012 (June 13, 2019) adopted an all-services overlay, and NANPA’s Planning Letter PL-529 (July 23, 2019) scheduled it: permissive 1+10-digit dialing from July 25, 2020, mandatory from January 23, 2021, and the 840 code in service February 23, 2021 — twenty years and thirteen days after 752’s cancelled debut. Carriers verified routing against test number 840-840-1840.
Nobody’s 909 number changed; new lines simply draw from either code. And the January 2021 dialing conversion put the region nine months ahead of the FCC’s 988-related changes, which forced ten-digit dialing on dozens of seven-digit codes — neighboring 951 among them — that October. NANPA’s dialing plan for the 909/840 complex lists every call, local or toll, at 1+10 digits.
The supply question is settled for a generation: the April 2026 edition of NANPA’s NPA Exhaust Analysis carries the 909/840 pair into the first quarter of 2056, with no jeopardy on file and no relief planning open. The code that spent its first decade running out of numbers is now provisioned for three more.
What a 909 display is worth
The 909/840 footprint is one of America’s densest logistics markets — the warehouse and distribution belt through Ontario, Fontana, and San Bernardino — and in that economy a local number is operational, not cosmetic. Dispatchers, brokers, and recruiters calling into the Inland Empire get answered on 909 digits; local presence dialing covers why the area code on the display moves pickup rates.
Recognizability has a shadow side, though: familiar digits are exactly what caller-ID spoofing borrows, which is why a signed, verifiable call matters more in a trusted code, not less.
The local DID numbers SIPNEX provisions across the 909 and 840 footprint — Ontario to Redlands, ordered by rate center — come from a carrier holding its own FCC license, with no reseller between you and the network. SIP trunking sized for dialer workloads carries the traffic, our own STIR/SHAKEN certificate signs every call at the A level, and RespOrg registration puts toll-free coverage on the same account.
909, for the record
Which cities and counties does the 909 area code cover?
Four counties. The core is southwestern San Bernardino County — San Bernardino, Ontario, Rancho Cucamonga, Fontana, Chino, Redlands, Yucaipa, and the mountain towns up to Big Bear. Eastern Los Angeles County adds Pomona, Claremont, Diamond Bar, La Verne, San Dimas, and Walnut. Riverside County contributes Calimesa and Eastvale, and a small slice of Orange County rounds out the map, per NANPA’s Planning Letter PL-529.
Is 840 replacing the 909 area code?
No. 840, an all-services overlay, has shared 909’s exact footprint since February 23, 2021. Existing 909 numbers never changed, and new lines are assigned from whichever code has inventory in the rate center. The two read equally local — the only difference is vintage, since no 840 number predates 2021.
Why was 909 never overlaid by area code 752?
It nearly was. NANPA’s Planning Letter PL-189 (August 26, 1999) scheduled a two-phase plan: split 951 off in 2000, then overlay the remaining 909 with 752 by February 10, 2001. The CPUC suspended the whole plan in December 1999, and PL-215 made the freeze official. When relief resumed in 2003, the commission chose a geographic split instead — so 752 never launched, and 909’s overlay waited until 840 arrived in 2021.
Are local calls in 909 dialed with seven or ten digits?
Ten — 1 plus the full number, on every call. Mandatory 1+10-digit dialing took effect January 23, 2021, one month before the 840 overlay entered service, because two codes on one map make seven-digit dialing ambiguous. A PBX or dialer still loaded with a seven-digit local dial plan from before 2021 will fail on calls within 909.
How long will 909 and 840 numbers stay available?
Decades. The 909/840 complex runs to the first quarter of 2056 in NANPA’s April 2026 NPA Exhaust Analysis, and the code is neither in jeopardy nor in relief planning. New numbers remain orderable across the region’s rate centers in one code or the other.
Can a company outside California get a 909 number?
Yes. A DID belongs to a rate center, not a street address, so a firm anywhere can present Ontario, Pomona, or San Bernardino digits while calls route over SIP to wherever its team sits. Inventory decides whether a given order fills from 909 or 840 — both display as Inland Empire numbers.
Selling into the Inland Empire? SIPNEX puts 909 and 840 numbers on your caller ID, with carrier-grade trunking and A-level attestation behind every call. Compare plans first if you like — then dial (833) 665-2220 or talk to the team.
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