504 Area Code: New Orleans, Louisiana

The 504 area code is New Orleans and its inner ring — Orleans and St. Bernard parishes, virtually all of Jefferson, plus much of Plaquemines, from Kenner and Metairie through the French Quarter to Chalmette. It is one of the 86 original area codes drawn in 1947, and it has never carried an overlay: every phone number in the footprint begins 504.

A no-context 504 call is typically New Orleans metro traffic — the code covers only the city plus its inner parishes — but treat that display as an unverified assertion, nothing more.

504 at a glance

Quick fact	Answer
In service since	January 1, 1947
Split from	Original 1947 code — Louisiana’s only code for a decade
Overlay	None — every round of relief was a split (1957, 1998, 2001)
Territory anchors	New Orleans, Kenner, Metairie, Gretna, Chalmette
Dialing	Ten-digit local dialing, mandatory since October 24, 2021
Exhaust projection	Third quarter of 2061, per NANPA’s April 2026 exhaust analysis

Big-city originals usually solved growth by stacking a second code on top of the first — Manhattan’s 212 shares its streets with three younger codes. 504 went the other way. Three times, Louisiana cut territory loose and left the city untouched, shrinking the code from an entire state to a single metro that answers on a single set of digits. Memphis’s 901, trimmed the same way and never overlaid, is one of the few big-city peers left.

From statewide to the southeast corner

The 1947 plan gave Louisiana a single code, and for a decade every call from Shreveport to the delta dialed under 504. NANPA’s database records the first cut on January 1, 1957, when the new 318 code took over roughly the northern and western half of the state. 504 kept the southeast: New Orleans, Baton Rouge, the river parishes, bayou country.

The second cut waited four more decades. Planning Letter PL-NANP-123 (June 9, 1998) records BellSouth advising that number growth required relief, and the Louisiana Public Service Commission chose another split: the New Orleans LATA kept 504 while the Baton Rouge LATA became 225 on August 17, 1998, with permissive dialing until April 5, 1999.

That letter also made a forecast worth filing away: the trimmed-down 504 was expected to exhaust in roughly five years. Hold that thought.

February 2001: the ring leaves, the city stays

The decisive cut came fast. The commission approved a third split on June 21, 2000, and NANPA’s Planning Letter PL-242 (October 20, 2000) set the schedule: at 12:01 a.m. on February 12, 2001, the new 985 code took everything around what the letter calls the basic New Orleans local calling area — the Northshore across Lake Pontchartrain, the river towns upstream, and bayou country down through Houma and Thibodaux.

Wireline permissive dialing ran to October 22, 2001; wireless carriers got an extended window into October 2002, widened to more prefixes at the commission’s request (PL-301, September 11, 2001). The split even divided Plaquemines Parish — upriver communities stayed on the city’s code while the delta’s far end, around Buras and Venice, moved to 985.

Katrina and the code that became a badge

When Hurricane Katrina flooded the city in August 2005, the network beneath 504 took a blow no numbering plan anticipates. An FCC order adopted September 21, 2005 (DA 05-2475) records service lost at as many as 24 BellSouth central offices, and waived the usual network-change notice rules for 180 days so the rebuild could move at recovery speed.

Residents scattered across the country, and their 504 mobile numbers went with them — number portability meant the digits kept ringing wherever their owners landed. Something shifted in those years: 504 stopped being mere routing information and became shorthand for the city itself, the kind of thing printed on T-shirts and dropped into song titles.

Seven-digit dialing survived until 988

Overlays are what force ten-digit dialing, and 504 never had one — so New Orleans kept dialing seven digits for local calls into the 2020s. What finally ended the habit was a hotline. Once the FCC designated 988 as the national suicide-and-crisis line, every area code that combined seven-digit dialing with a working 988 prefix had to convert. NANPA’s Planning Letter PL-556 (January 8, 2021) lists all 82 of them; Louisiana supplied two, 337 and 504.

Permissive ten-digit dialing arrived April 24, 2021, the mandatory date was October 24, 2021, and 988 itself went live July 16, 2022. The old habit survives next door: NANPA’s database still shows seven-digit local dialing in Baton Rouge’s 225 and the surrounding 985 — the code that stayed urban converted, and the territory it shed dials like it’s 1995.

The forecast that missed by six decades

Back to PL-123’s prediction that 504 would exhaust around 2003. The 985 split reset the clock, and demand never caught back up. NANPA’s April 2026 NPA Exhaust Analysis puts 504’s exhaust in the third quarter of 2061 — and the date keeps receding; the October 2025 edition had said 2054. No jeopardy status, no relief plan on the horizon. The one-code era has decades left to run.

A clean read on caller ID

Overlay markets blur what local looks like on a screen; New Orleans doesn’t. Within the parishes, metro-local means 504, which makes the display an unusually clean signal for any business calling into the market — a roofer in Metairie or an out-of-state firm selling into the port economy alike. Our local presence dialing guide walks through why the pickup odds move. What the digits can’t do is prove origin: caller-ID spoofing can hang the city’s code on a call from anywhere, so treat an unfamiliar 504 display as a claim, not a credential.

SIPNEX is an FCC-licensed carrier — direct authorization rather than resold access — and fills New Orleans–area DID orders by rate center across the 504 footprint, delivered wherever the PBX or dialer lives, over SIP trunking. Outbound traffic is attested at the A level with the company’s own STIR/SHAKEN certificate, so the 504 on the display arrives with proof behind it.

Straight answers on the 504 area code

What territory does the 504 area code serve?

The New Orleans metro: Orleans, Jefferson, and St. Bernard parishes plus much of Plaquemines — the city itself along with Kenner, Metairie, Gretna, Harvey, and Chalmette. The surrounding region left in the 2001 split: the Northshore, the river parishes, and the Houma–Thibodaux bayou country all dial 985, while Baton Rouge has been 225 since 1998. Jefferson Parish carries one exception: Grand Isle, out on the barrier island, went to 985 with the rest of the coast.

Is 504 an original 1947 area code?

Yes. NANPA’s database records 504 in service on January 1, 1947, as Louisiana’s one and only code — the whole state, Shreveport to the delta, dialed under it for a decade. The 318 split of January 1957 took the north and west, the 225 split of August 1998 took Baton Rouge, and the 985 split of February 2001 took the surrounding parishes, leaving the original digits to the city alone.

Why has 504 never been overlaid with a second code?

Every round of relief was handled by cutting territory away instead of adding a code on top — 1957, 1998, and 2001. After the last split, demand in the trimmed footprint never again outran supply: NANPA’s April 2026 exhaust analysis leaves 504 with numbers until the third quarter of 2061, with no relief plan in sight. New Orleans is likely to remain a one-code market for decades.

When did local calls in the 504 area code become ten digits?

October 24, 2021 — and not because of an overlay. The FCC’s designation of 988 as the national crisis line required ten-digit dialing in every code where 988 was already a working prefix, and 504 sits on NANPA’s Planning Letter PL-556 list of 82 converting codes. Permissive dialing started April 24, 2021; 988 itself went live on July 16, 2022.

Can I get a 504 number for a business outside Louisiana?

Yes. Numbers belong to rate centers, not street addresses, so a company anywhere can run a 504 DID over SIP service and answer New Orleans calls with New Orleans digits. Inventory is a practical question rather than a regulatory one — and with exhaust projected in the 2060s, the supply side of 504 is unusually comfortable.

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A full carrier desk behind the Crescent City’s code: SIPNEX supplies local DIDs across the 504 map and nationwide, engineers SIP trunks for PBX and dialer load, registers toll-free through its own RespOrg, and signs every call at the A level with its own STIR/SHAKEN certificate. The desk picks up at (833) 665-2220 — or talk to the team in writing and check current rates first.