Area Code Atlas

NANP-Overlay of 610 (Pennsylvania) Numbering Plan Area (NPA) with 484 NPA

Area code 484 added as overlay

Area code 484 was introduced as an overlay for the 610 region on June 5, 1999, to accommodate regional growth in southeastern Pennsylvania. This change was implemented to address number exhaustion and required the introduction of mandatory ten-digit dialing for all calls within the region.

Mandatory ten-digit dialing for 610 and 484

Mandatory ten-digit dialing was introduced in the 610 and 484 area codes on June 5, 1999, coinciding with the activation of the 484 overlay.

Extraordinary NPA-Specific Jeopardy Conservation Procedures Announced for 484 and 610 NPAs (Pennsylvannia)

NPA 835 established for 610/484 overlay

The Pennsylvania Public Utility Commission established area code 835 in May 2000 as an additional overlay for the 610/484 region. The new code was intended to be implemented in 2001 to provide additional numbering resources.

Consensus reached for overlays 445 and 835

On May 18, 2000, the Pennsylvania telecommunications industry reached consensus to implement area code 445 as an overlay for NPAs 215 and 267, and area code 835 as an overlay for NPAs 610 and 484.

NPA 445 to Overlay NPAs 215 and 267 (Pennsylvania)NPA 835 to Overlay NPAs 610 and 484 (Pennsylvania)

Correction to Assignment Procedures for the Remaining Central Office Codes in 215 and 267 NPAs, and in the 610 and 484 NPAs (Pennsylvania)

Plans for NPA 835 withdrawn

The Pennsylvania Public Utility Commission formally withdrew plans for the 835 overlay in the 610/484 area codes on June 23, 2005, after number conservation measures and number pooling eliminated the immediate need for a new overlay. The 835 code remained reserved for future use.

NPA 835 approved for 610/484 overlay complex

Area code 835 was approved by the Pennsylvania Public Utility Commission on December 2, 2021, to provide additional numbering resources for the 610/484 overlay complex, responding to projected number exhaustion.

NPA 835 overlay on 484/610 announced

NPA 835 to Overlay NPA 484/610 (Pennsylvania)

NPA 835 activated for 610/484 overlay complex

Area code 835 was activated on September 2, 2022, with assignment of central office codes beginning in the 610/484 overlay region in Pennsylvania.

Area code 835 assigned

Area code 835 was approved on December 2, 2021, and began assignment on September 2, 2022, as an overlay for the 610/484 region in Pennsylvania.