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What is an Exhausted NPA?

In this guide we will explain Exhausted NPA codes in the United States and their respective overlay's

Dillin avatar
Written by Dillin
Updated over a week ago

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

DC

202

CT

203

AL

205

ID

208

CA

209

TX

210

NY

212

TX

214

PA

215

IL

217

MD

240

MI

248

AL

256

PA

267

KY

270

TX

281

MD

301

CO

303

WV

304

FL

305

CA

310

IL

312

MO

314

NY

315

IN

317

CA

323

OH

330

NC

336

NY

347

WA

360

NE

402

GA

404

OK

405

FL

407

CA

408

MD

410

CA

415

OH

419

MD

443

TX

469

GA

470

PA

484

OR

503

MA

508

CA

510

TX

512

OH

513

NY

516

NY

518

VA

540

OR

541

FL

561

PA

570

MO

573

MS

601

NH

603

PA

610

OH

614

TN

615

MA

617

IL

618

CA

619

IL

630

NY

631

NY

646

GA

678

NV

702

VA

703

NC

704

GA

706

CA

707

IL

708

TX

713

CA

714

PA

717

NY

718

CO

720

PA

724

NJ

732

OH

740

VA

757

CA

760

GA

770

IL

773

MA

781

FL

786

PR

787

UT

801

SC

803

CA

805

IN

812

FL

813

PA

814

IL

815

TX

817

CA

818

TX

832

SC

843

NY

845

IL

847

FL

850

CT

860

AR

870

TX

903

CA

909

NV

910

CA

916

NY

917

OK

918

NC

919

OH

937

FL

954

TX

972

NJ

973

MA

978

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