Area Code Atlas

Area code 202 introduced as original area code for Washington, D.C.

Area code 202 was established in October 1947 as one of the original North American area codes, serving the entire District of Columbia. It was the second NPA assigned, following 201 in New Jersey.

Permissive dialing period begins after end of central office code protection in Washington Metropolitan Exchange Area

On April 1, 1990, a permissive dialing period began in the Washington Metropolitan Exchange Area following the termination of central office code protection. This allowed additional prefixes to be assigned and marked the transition toward new dialing procedures. During this period, seven-digit dialing remained for home-NPA local calls, while other call types required ten-digit or 1+ten-digit dialing.

Permissive dialing period begins after end of central office code protection in Washington metro

A permissive dialing period began on April 1, 1990, following the termination of central office code protection in the Washington Metropolitan Exchange Area. Bellcore announced a new dialing plan affecting area codes 202, 301, and 703, allowing additional prefixes to be assigned and marking the transition away from seven-digit dialing for some call types. The change aimed to eliminate protected central office codes and free numbering resources, providing callers time to adapt before mandatory implementation.

NANP - INTRODUCTION OF DIALING PROCEDURE CHANGES IN THE 202 AND PORTIONS OF THE 301 AND 703 NUMBERING PLAN AREA (NPAS)

Washington metropolitan dialing changes took full effect

The permissive dialing period tied to the end of central office code protection ended on October 1, 1990. The article describes the revised dialing rules for home-NPA, foreign-NPA, toll, and operator-assisted calls.

First Direct Distance Dialing call using NPA 201

On November 10, 1951, the first customer-dialed long-distance call was made from Englewood, New Jersey (area code 201) to Alameda, California (area code 415), marking the introduction of Direct Distance Dialing, allowing customers to place long-distance calls without operator assistance.

Announcement of area code 771 overlay for 202

The North American Numbering Plan Administrator announced in October 2020 that area code 771 would overlay area code 202 in the District of Columbia to address number exhaustion. The Public Service Commission approved a phased implementation plan over 13 months, with the overlay intended to provide additional numbering capacity.

NANPA announces 771 overlay for Washington, D.C.

On October 22, 2020, the North American Numbering Plan Administrator announced the addition of area code 771 as an overlay for the District of Columbia to address impending number exhaustion in area code 202. The Public Service Commission approved a phased implementation plan.

NPA 771 added as an overlay to NPA 202

Area code 771 was added to the Washington, D.C. numbering plan area in April 2021 to mitigate impending number shortages.

Start of permissive ten-digit dialing for 202/771 overlay

A permissive dialing period began on April 10, 2021, allowing callers in the District of Columbia to dial either seven or ten digits for calls within the area. This was the initial step in implementing the 771 overlay, facilitating a transition to mandatory ten-digit dialing.

NPA 908 split from 201

On June 8, 1991, area code 908 was created by splitting the north-central regions of New Jersey from area code 201. This change primarily served to address the increasing demand for telephone numbers in the state, relieving number exhaustion in the 201 area.

Mandatory ten-digit dialing for 202/771 overlay complex

Mandatory ten-digit dialing was implemented on October 9, 2021, for all calls within the District of Columbia. This change was required to accommodate the 771 overlay and ensure sufficient numbering resources.

Mandatory ten-digit dialing begins for 202/771 overlay

Mandatory ten-digit dialing for all calls within the District of Columbia began on October 10, 2021, completing the transition to the 771 overlay complex.

Area code 771 activated as all-services overlay on 202 in Washington, D.C.

Area code 771 was activated on November 8, 2021, as an all-services overlay for the District of Columbia, supplementing the existing 202 area code. The first central office code assignment for 771 occurred on this date.

NPA 973 split from 201

On June 1, 1997, area code 973 was created by splitting Essex, Passaic, Morris, and Sussex counties from area code 201. This split was implemented to provide additional numbering resources for northern New Jersey, leaving 201 to cover only Hudson and Bergen counties.