What are NPA codes?

The numbering planning area (NPA) are the three digit numbers that identify the region of specific localities across North America. For example, our US office is located in downtown Chicago, IL and the area code for this locality is 312.

Note: Several rate centers, across a locality, can also share the same NPA. A rate center can be found by finding the NPA - NXX of a phone number.

  • NPA: Number Plan Area (aka Area Code)

  • NXX: Number Prefix (first 3 digits of your telephone number)

Where

  • N can be any number from 2 to 9

  • P, A, can be any number from 0 to 9

  • X can be any number from 0 to 9

For example: (858) 922-1234:

  • 858 is an area code assigned in California.

  • 858-922 is an exchange assigned to Verizon Wireless associated with the La Jolla rate center.

  • 1234 is the line number.

Exhausted NPA

An exhausted NPA refers to the area codes where almost all numbering resources are assigned and the industry has minimal available numbers. The only way to establish more resources within an active NPA's operational area is through an industry overlay.

Overlay: Overlay is an area code that's added to a region already serviced by another area code. Overlays require the industry to switch from ten digit dialing rather than seven - an easy switch for Telnyx because we already operate on 10 digit dialing!

If you’re trying to order new telephone numbers in a desirable area code, you may find there are limited quantities available. In this case, expanding your search with an overlay can be incredibly helpful.

For example: in the year 2010, the New York City area code 212 became exhausted. To provide relief, the industry added 917 and 646 as Overlays, bringing new available numbers to the area. All of these area codes service the same geographic region as 212. More information about relief planning is available here

Below mentioned is the updated list of Exhausted NPA's:

STATE

NPA

NJ

201

CT

203

AL

205

NY

212

TX

214

PA

215

MI

248

PA

267

KY

270

TX

281

MD

301

CO

303

WV

304

FL

305

CA

310

IL

312

NY

315

IN

317

CA

323

OH

330

NC

336

NY

347

WA

360

NE

402

GA

404

FL

407

CA

408

MD

410

CA

415

OH

419

MD

443

OR

503

MA

508

TX

512

NY

518

OR

541

WA

564

PA

570

MS

601

PA

610

OH

614

MA

617

IL

630

NY

646

GA

678

NV

702

VA

703

NC

704

GA

706

TX

713

CA

714

PA

717

NY

718

PA

724

NJ

732

CA

760

GA

770

IL

773

PR

787

UT

801

IN

812

IL

815

TX

817

CA

818

TX

832

SC

843

IL

847

CT

860

TX

903

NY

917

OK

918

NC

919

TX

972

NJ

973

MA

978

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