The 856 area code is southwestern New Jersey — Camden, Cherry Hill, Haddonfield, Woodbury, Glassboro, Salem, Bridgeton, Millville, and Vineland, from the Delaware River towns facing Philadelphia to the farmland reaching Delaware Bay — split from 609 on June 12, 1999, and never overlaid: every 856 number still issues from the original pool.
An 856 number you don’t recognize is usually a clinic, a township office, or a business working the Philadelphia market from the Jersey bank — the digits pin down a number’s home turf, nothing about the hands holding it.
856, summarized
| Fast facts | 856 |
|---|---|
| Established | June 12, 1999 — the last geographic split drawn in New Jersey |
| Descended from | 609 — took the southwestern share under Planning Letter PL-NANP-173 |
| Relief status | No overlay, and no relief project on NANPA’s books as of August 2026 |
| Marquee towns | Camden, Cherry Hill, Woodbury, Glassboro, Vineland |
| Digits required | Ten-digit local since October 24, 2021; 1 plus ten on toll calls |
| State’s earliest exhaust | First quarter of 2035, per the April 2026 analysis |
Three rows of that table do unusual work. This is the code that closed the boundary-drawing era in New Jersey; the code whose own split stayed deliberately leaky for nineteen years; and the code now standing first in the state’s exhaust queue with nothing filed to relieve it. The paper trail runs through four planning letters and a spreadsheet NANPA refreshed this summer.
The last split on the New Jersey map
New Jersey spent half a century being subdivided. 201, the numbering plan’s very first code, covered the whole state in 1947; 609 took the south in 1957; 908 took the center in 1990; and on a single June morning in 1997, 973 and 732 carved off Newark’s orbit and the Shore. How splits and their gentler successor, the overlay, divide a map is the subject of our guide to how area codes work.
South Jersey’s turn came last. Planning Letter PL-NANP-173 (May 5, 1999) recorded the relief plan the Board of Public Utilities had approved: 609 would keep its eastern share, while the new 856 took what the letter calls the southwestern portion of the existing territory. It went live at 12:01 a.m. Eastern Daylight Time on Saturday, June 12, 1999 — and no New Jersey area-code boundary has been drawn since. Every code the state added afterward arrived as an overlay on an existing map.
The mechanics ran on the customary ramp. For five months either code completed a call into the new territory; permissive dialing closed at 12:01 a.m. on November 13, 1999, after which a misdialed code reached an informational announcement. Bell Atlantic–New Jersey held the 856-466 prefix for network testing, so carriers spent the summer and fall verifying their routing against 856-466-TEST (8378) and its recorded confirmation.
One line in the letter rewards a slow read: Bell Atlantic–New Jersey’s central offices in the new territory were modified “on a progressive basis” between June 14 and August 23, 1999 to transmit 856 in the calling-number ANI. For ten weeks, which code a call reported as its origin depended on whether its particular switch had been converted yet — a reminder that an area code is not one fact but thousands of switch entries.
Where in New Jersey is the 856 area code?
The relief map bound into PL-NANP-173 draws the line from the riverfront above Moorestown down to Delaware Bay. On the 856 side: Camden and its river towns — Riverton, Moorestown, Merchantville, Collingswood, Haddonfield; Woodbury, Paulsboro, Swedesboro, Pitman, Glassboro, and Mullica Hill through the middle; Penns Grove, Woodstown, and Salem along the lower Delaware; Blackwood, Berlin, and Williamstown on the eastern flank; and Vineland, Millville, and Bridgeton across the farm belt, with Cedarville and Port Norris carrying the code to the bayshore.
Cherry Hill belongs to the code as well — the township’s own municipal offices keep an 856 number — and directly across the water sits the region’s other numbering world, Philadelphia’s 215 and its overlays. The Delaware is as hard a border for prefixes as for states, which keeps the code legible: 856 means the Jersey side of the metro, with no second code sharing its map.
Seventy-eight prefixes with a foot on each side
Most splits make their boundary absolute the day permissive dialing ends. This one was ordered porous: the Board of Public Utilities required protected codes in specified municipalities and concurrent rate areas, and where they existed, providers simply kept transmitting seven digits across the 609/856 line. PL-NANP-173’s attachment tallies the carve-out at seventy-eight prefixes spread over thirteen rate centers — Burlington, Marlton, Medford, Glassboro, Vineland, Millville, Williamstown, and Port Norris among them.
The arrangement outlasted almost everyone’s attention span. It ended only when the parent code gained its 640 overlay: Planning Letter PL-508 (May 26, 2017) records the Board’s April 21, 2017 order in Docket TO13121166 approving the overlay and eliminating the protected codes between the two NPAs, with 1 plus ten digits required across the line once mandatory dialing arrived on August 18, 2018. The 609 side of the same story is told in that code’s own guide.
The bill for prefix 988
Inside its own borders, meanwhile, 856 went right on dialing seven digits — the 2018 conversion bound the 609/640 territory, not this one. What finally ended the habit was national. The FCC’s order adopted July 16, 2020 (FCC 20-100) made 988 the three-digit suicide-and-crisis shortcut, and any code still dialing seven digits around a working 988 prefix had to convert — a local number starting 988 would collide with the shortcut.
856 qualified on both counts — a 988 prefix sits in the 856 NXX list attached to the 1999 split letter. NANPA’s Planning Letter PL-556 — January 8, 2021, in supersession of PL-544 — published the national roster: 82 area codes, with New Jersey contributing exactly two, 856 and 908. Permissive ten-digit dialing opened April 24, 2021; mandatory dialing took effect October 24, 2021; carriers were given until July 15, 2022 to finish rolling enforcement cutovers; and 988 went live nationwide on July 16, 2022.
That conversion closed a twenty-two-year run of seven-digit dialing — three years longer than the parent code managed after the split. Today’s plan is PL-556’s standard chart: ten digits on every local call, 1 plus ten on toll calls, with providers free to take 1 plus ten on local calls as well.
Where New Jersey runs out first
PL-NANP-173 opened with a forecast: five years of life for the new code. NANPA’s April 2026 exhaust analysis — built on the numbering data carriers reported through March 1 — instead projects 856’s prefix supply into the first quarter of 2035, a five-year estimate now stretched into a fourth decade. The current edition even added runway, moving the date three quarters past the October 2025 study, and a July 6, 2026 revision sheet of four Texas entries touched nothing in New Jersey.
The rest of the state stands behind it. 908 is projected to the third quarter of 2039, the 609/640 pair to 2046, 201/551 to 2048, 732/848 to 2051, and the 862/973 pair to 2052. The two codes PL-556 flagged in 2021 are thus also the two at the head of the exhaust queue — the state’s last single-code territories — and 856 is the likelier of the pair to need New Jersey’s next area code.
Nothing is in motion yet. NANPA’s monthly relief-planning status file, current to mid-August 2026, carries no New Jersey entry: no jeopardy declaration, no docket, no filing. When relief eventually comes, the modern remedy is an overlay, which changes no existing number — and the arithmetic that turns prefix counts into dates like 2035 is unpacked in our NPA-NXX guide.
Putting an 856 number on the display
For an outbound operation, the code’s undivided map is a commercial fact. A Camden or Vineland prospect reads 856 as a neighbor, a 215 display as the far side of the bridge, and an out-of-state code as a stranger. That recognition gap is the entire case for local presence dialing, and it runs stronger here than in overlay markets because nothing blurs what the digits mean.
What the digits cannot do is vouch for the caller — caller-ID spoofing brands 856 onto traffic from anywhere on earth. The durable signal is cryptographic: the STIR/SHAKEN attestation a carrier signs into the call itself, which survives every hop the display does not.
SIPNEX signs at the top of that scale. Operating on its own FCC carrier authorization rather than a reseller agreement, it provisions local DID numbers in Camden, Vineland, Glassboro, or any other US rate center with inventory, delivers them over SIP trunking to the PBX or dialer already in place, applies A-level attestation under its own STIR/SHAKEN certificate, and carries toll-free service on its own RespOrg registration.
South Jersey wants to know
Which New Jersey towns use the 856 area code?
Camden, Cherry Hill, Collingswood, Haddonfield, Moorestown, Woodbury, Glassboro, Vineland, Millville, Bridgeton, and Salem lead the list. The 1999 relief map runs the code from Riverton and Moorestown at its northern edge through Blackwood, Berlin, and Williamstown on the eastern flank, down to Penns Grove, Woodstown, Cedarville, and Port Norris at Delaware Bay. Philadelphia, directly across the river, dials 215 and its overlays.
What area code did 856 numbers belong to before June 1999?
609 — the whole territory dialed as 609 until the split took effect on June 12, 1999. Planning Letter PL-NANP-173 assigned the new code the southwestern portion of the old map under a plan approved by the Board of Public Utilities, ran permissive dialing until November 13, 1999, and pointed misdials to an informational announcement afterward. Carriers checked routing against test number 856-466-TEST (8378), and the parent code’s continuing history is in our 609 guide.
Is an overlay coming to the 856 area code?
Not on any current schedule — no overlay exists, and NANPA’s relief-planning status report showed no New Jersey project as of August 2026. The April 2026 exhaust analysis projects 856’s prefixes lasting into the first quarter of 2035, so a relief docket lies years out. When one opens, the standard remedy is an overlay: a second code across the same territory, with every existing 856 number keeping all ten of its digits.
What ended seven-digit dialing in the 856 area code?
October 24, 2021 — the mandatory date NANPA’s Planning Letter PL-556 set for all 82 codes converting ahead of the 988 crisis line. New Jersey’s two entries were 856 and 908; permissive ten-digit dialing had run since April 24, 2021, and carriers had until July 15, 2022 to complete their enforcement cutovers — the 988 shortcut went live nationwide the next day. Calls crossing into neighboring 609 had already required 1 plus ten digits since August 18, 2018, when the protected codes left over from the 1999 split were retired.
Will 856 or 908 need New Jersey’s next area code first?
856, on the current numbers — its first-quarter-2035 exhaust projection leads 908’s third quarter of 2039 in NANPA’s April 2026 analysis. They are the state’s last two single-code territories, so whichever empties first triggers New Jersey’s first relief project since the 640 overlay. July 6, 2026’s revision sheet adjusted four Texas forecast entries and nothing else, and 856 DID inventory across the code’s rate centers remains orderable today.
Twenty-seven years after New Jersey drew its last area-code line, everything inside it still runs on a single set of digits. SIPNEX provisions 856 rate-center numbers under a direct FCC license, delivers them anywhere over SIP, and signs every outbound call at A-level attestation on its own certificate. Rates are posted at SIPNEX pricing, the contact form takes questions in writing, and (833) 665-2220 takes them by voice.
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