Area Code Overview

Area code 878 is a geographic telephone area code in Pennsylvania that went into service on August 17, 2001. The geographic regions covered by this area code overlay has a population of approximately 1,662,262.

Overlay and Dialing Rules

Area Code: 878
State: Pennsylvania
Type: General Purpose Code
In Service Date: August 17, 2001
Overlay Complex: 412/724/878
Local Dialing Plan: This area does require you to dial the area code when calling locally.

Estimated Number of Assigned Phone Numbers in Area Code 878

This area code is ranked 308th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 13th out of 15.

1,386,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 878

Total assigned 1,386,000

Wireless

339,000 assigned

24.46%

Wireline and VoIP

874,000 assigned

63.06%

Other / Unclassified

173,000 assigned

12.48%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 878

Estimated assigned wireless phone numbers: 339,000

Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.

AT&T Wireless 115,000 (33.92%)

Verizon Wireless 104,000 (30.68%)

AERIAL COMMUNICATIONS, INC. 99,000 (29.20%)

T-Mobile 20,000 (5.90%)

Optimum Mobile 1,000 (0.30%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 878

Estimated assigned wireline and VoIP phone numbers: 874,000

Onvoy 427,000 (48.86%)

Spectrum 130,000 (14.87%)

Commio 49,000 (5.61%)

Comcast Business 41,000 (4.69%)

Telnyx 39,000 (4.46%)

Bandwidth 38,000 (4.35%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC 33,000 (3.78%)

TERRA NOVA TELECOM INC. 33,000 (3.78%)

Lumen 31,000 (3.55%)

Peerless Network 27,000 (3.09%)

PAETEC ITEL, LLC 5,000 (0.57%)

ARMSTRONG TELECOMMUNICATIONS, INC. - PA 4,000 (0.46%)

Other / Unclassified Assigned Numbering in Area Code 878

Estimated assigned other or unclassified phone numbers: 173,000

TON80 COMMUNICATIONS, LLC 50,000 (28.90%)

CORE COMMUNICATIONS, INC. - PA 41,000 (23.70%)

HD CARRIER LLC 19,000 (10.98%)

IP HORIZON LLC 18,000 (10.40%)

FRACTEL, LLC 16,000 (9.25%)

TELEPORT COMMUNICATIONS AMERICA, LLC - PA 12,000 (6.94%)

EXIANT COMMUNICATIONS LLC 5,000 (2.89%)

FULL SERVICE NETWORK LP 3,000 (1.73%)

IDT AMERICA, CORP. - PA 3,000 (1.73%)

STRATUS NETWORKS 3,000 (1.73%)

CONSOLIDATED COMMUNICATIONS OF PENNSYLVANIA CO 2,000 (1.16%)

AHOI LLC 1,000 (0.58%)

Cities and Towns in Area Code 878

These geographic regions are also served by area codes 412 and 724.

How These Figures Were Built

These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 878, not live customer counts.

Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.

They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.

Population data and locality matching provided by GeoNames.

Last refreshed: April 15, 2026 6:22 pm