The 845 area code takes in New York’s mid- and lower Hudson Valley — all of Rockland, Putnam, Orange, and Ulster counties plus parts of Dutchess, Sullivan, Columbia, Greene, and Delaware, taking in Newburgh, Poughkeepsie, Kingston, Middletown, New City, and West Point. Since March 24, 2023, it has shared every inch of that territory with 329, the mid- and lower Hudson Valley’s first overlay code.
845 began as the losing half of a split — the side that had to change its number — then spent two decades growing into a code that needed relief of its own. The shape of that relief was decided, oddly enough, by a suicide-prevention hotline.
The half that renumbered
When the old 914 territory ran short of prefixes in the late 1990s, New York’s Public Service Commission approved a geographic split on November 4, 1999 (Opinion 99-11, Case 99-C-0800). Westchester County kept 914 and its dialing habits. Everyone north and west of the county line, from the Tappan Zee to the Catskills, took the new digits.
NANPA’s Planning Letter PL-211 (February 9, 2000) set the changeover at 12:01 a.m. on Monday, June 5, 2000, opening a six-month stretch in which either code completed a call. Mandatory dialing was slated for December 4 — until PL-232 (June 7, 2000) pushed it to Saturday, December 9, at the request of the state and Bell Atlantic, so the network conversion could run over a weekend instead of a Monday morning.
For its first months, 845 was an area code with no numbers of its own — every prefix in it was an inherited 914 assignment wearing new digits. Activation of brand-new central office codes in 845 only began on February 23, 2001.
Why Westchester is still on the 845 paperwork
The split line followed the county boundary between Westchester and its northern neighbors, and county lines ignore rate-center lines. PL-211 named six rate centers the boundary cut in two — Peekskill, Lakeland, Mahopac, Croton Falls, Purdys, and North Salem — and their 914 prefixes had to be duplicated in 845 for the same carriers serving the far side.
Those slivers never went away. More than two decades on, NANPA’s overlay planning letter still describes 845 as serving all or parts of ten counties — Westchester among them — even though 914 remains the Westchester code. It is one of the stranger footnotes a split boundary ever left behind.
The hotline that picked the relief method
845 had 988 assigned as an ordinary local prefix, which put it on NANPA’s 988-transition list when the FCC designated those three digits for the national crisis line: PL-544 (August 17, 2020) laid out the plan, and under the final PL-556 schedule the valley’s seven-digit local dialing ended for good on October 24, 2021 — the same schedule that converted Buffalo’s 716 at the far end of the state.
That conversion carried a consequence almost nobody noticed at the time. The industry’s relief-planning guidelines, amended for the 988 transition, provide that once a code is moving to ten-digit dialing, an overlay is the only relief method even considered. The split-versus-overlay debate that consumed the region in 1999 was settled in advance for the next shortage — which was already weeks away.
Sixteen months from petition to dial tone
NANPA petitioned New York for 845 relief on November 30, 2021, projecting exhaust by the third quarter of 2024 at the latest. A January 6, 2022 supplement tore up that estimate: third quarter of 2023. A jeopardy condition was declared, prefix rationing took effect, and the calendar got very short.
The Public Service Commission moved quickly, ordering an all-services overlay of the entire 845 footprint on April 14, 2022 in Case 21-C-0600. NANPA’s PL-591 (May 11, 2022) put 329 in service on March 24, 2023, with a test number — 329-990-8378 — answering from December 24, 2022. No existing number changed, and no dialing changed either: the 988 conversion had already done that part.
PL-591 attached one unusual condition. 329 prefixes may be assigned only after every assignable 845 prefix is gone — the new code sits sealed as a reserve tank rather than filling alongside the old one.
Where the 845/329 complex stands in 2026
Local calls anywhere in the overlay footprint are ten digits, with 1+10 for calls beyond it — unchanged since October 2021. NANPA’s April 2026 NPA Exhaust Analysis moved the 329/845 complex’s projected exhaust to the fourth quarter of 2055 — a seventeen-quarter gain over the October 2025 forecast, credited to reduced demand — and the July 6, 2026 revision list left it untouched. Two codes deep, the valley is provisioned for decades.
Earning the pickup between the city and the Catskills
The footprint runs from commuter towns across the Tappan Zee to Catskill resort country, with the mid-Hudson city trio of Newburgh, Poughkeepsie, and Kingston in between. For a business calling into that market, 845 on the screen reads as a neighbor — the effect local presence dialing is built on — while an unfamiliar code reads as a solicitation.
The display deserves scrutiny too: numbers port, VoIP answers anywhere, and spoofed caller ID can dress any call in Hudson Valley digits. The difference between presence and disguise lives at the carrier layer, in whether the originating provider actually knows its caller.
SIPNEX works at that layer. Holding its own FCC carrier authorization rather than reselling someone else’s, it assigns 845 DIDs exchange by exchange, moves them over SIP trunking — PBX, softswitch, or dialer — and can add toll-free numbers through its RespOrg registration where a campaign needs both.
Outbound traffic goes out A-level signed by a STIR/SHAKEN certificate held in SIPNEX’s own name, with its Robocall Mitigation Database registration on file — the credential layer that separates a genuine 845 presence from a costume.
Questions people ask about 845 and 329
Which counties does the 845 area code serve?
Rockland, Putnam, Orange, and Ulster counties in full, plus parts of Dutchess, Sullivan, Columbia, Greene, and Delaware — Newburgh, Poughkeepsie, Kingston, Middletown, Monroe, New City, and Spring Valley all answer on it. NANPA’s paperwork also lists slivers of Westchester, a leftover of the six rate centers the 2000 split boundary cut in half.
When did 845 split off from the 914 area code?
At 12:01 a.m. on June 5, 2000, under NANPA Planning Letter PL-211, following New York’s November 4, 1999 split order. Westchester County kept 914; the rest of the old territory became 845. Both codes completed calls until mandatory dialing began December 9, 2000 — a date PL-232 moved from December 4 so the conversion could run over a weekend.
What is the 329 area code, and does it replace 845?
329 covers exactly the same Hudson Valley territory as 845 — an all-services overlay in service since March 24, 2023 under NANPA Planning Letter PL-591. It replaces nothing: 845 numbers continue as they are, and 329 prefixes are assigned only after the 845 inventory is used up.
Do existing 845 numbers change because of the overlay?
No. An overlay adds a second code on top of the same map instead of redrawing it, so every 845 customer kept their full ten-digit number when 329 arrived in 2023. That is the opposite of what the region experienced in 2000, when the split forced everyone outside Westchester to change area codes.
Are local calls in the 845 area code ten digits?
Yes, since October 24, 2021 — and not because of the overlay. 988 was already dialable as a local prefix in 845, so NANPA’s 988-transition schedule (PL-556) ended seven-digit dialing before the crisis line launched. When 329 went live in 2023, the dialing plan didn’t need to change at all: ten digits locally, 1+10 beyond the overlay footprint.
Can a company outside New York run an 845 number?
Yes. Local numbers belong to rate centers, not street addresses, so a firm in any state can hold an 845 DID and answer it over SIP wherever its people sit. For teams selling into the Hudson Valley, the local display earns answered calls that an out-of-region code would not.
A code born renumbering its whole valley now has headroom to 2055 — plenty of runway for a local calling program. SIPNEX supplies 845 DIDs by rate center, carries them on dialer-grade SIP trunks, and puts an A-level signature on every call under its own STIR/SHAKEN certificate. (833) 665-2220 is the direct line; before you commit, check DID and trunk rates or write to the carrier desk.
Keep reading.
The carrier built by operators, for operators.
FCC-licensed carrier with its own STIR/SHAKEN SP certificate. Operator-owned. SIP trunks built for operators who dial at volume.