The California Public Utilities Commission approved on October the 20th, 2011 the introduction of an overlay area code as a relief plan for existing NPA 408 serving cities such as Santa Clara, Cupertino, San Jose, Sunnyvale. The new area code 669 will cover the exact same area currently covered by area code 408. As a result 1+10 digit dialing will be the dialing format for residents of this area. Permissive 1+10 digit dialing in area code 408 will commence on April 21, 2012 and end on October 20, 2012 when 1+10 digit dialing becomes mandatory. The new area code 669 will officially be activated on November the 20th, 2012.

See official NANPA announcement and map of the new overlay complex (PDF document)

The Canadian province of Manitoba will have a new area code starting on November the 3rd, 2012. The new area code 431 will overlay NPA 204 currently covering the whole province of Manitoba with cities such as Winnipeg, Steinbach, Thompson, Winkler. Starting July 29, 2012 carriers operating in this area can choose to precede all calls with an announcement notifying callers that local calls should be dialed using the 10 digit format. 10 digit dialing will become mandatory on November 3.

See the official NANPA announcement and map of the new overlay complex (PDF document)

A new area code was recently announced for the Western Quebec communities of Drummondville, Gatineau, Sherbrooke, Trois-Rivieres and more. The new area code 873 will become active on September the 15th, 2012 and will cover the same geographic area currently served by area code 819. With the introduction of the new 873/819 overlay complex this area will use 10 digit dialing for local calls. I couldn’t find any details in the official announcement regarding a permissive 7/10 digit dialing period (a 3 month or more permissive period is generally used before an overlay area code is introduced; this way people can get used to dialing 10 digits instead of 7).

See the official NANPA announcement and map of the new area code (PDF document)

A new area code 667 will be activated on March 24, 2012 for the eastern part of Maryland currently served by area codes 410 and overlay area code 443 and covering cities such as Aberdeen, Baltimore, Ellicott City, Dundalk. The introduction of the new code was decided back in 2001. Since this part of Maryland has 2 area codes already and therefore 10 digit dialing has been mandatory since the introduction of area code 443 in 1997, no permissive 10 digit dialing will be needed.

See the official NANPA announcement and map of the new area code (PDF document)

Sint Maarten is a Caribbean territory known as a Constituent Country of the Kingdom of the Netherlands. Sint Maarten along with 5 more islands (Aruba, Bonaire, Curacao, Saba and Sint Eustatius) used to constitute the Netherlands Antilles until October 2010 when the country was disolved. The southern part of the Sint Maarten island (also known as Saint Martin) now uses the North American Numbering Plan and has been assigned area code 721 introduced on September 30, 2011. Before the aforementioned date Sint Maarten had used country code 599 which remains in service for Bonaire, Curacao, Saba and Sint Eustatius. The old and new numbering systems will run in parallel for a year (people using country code 599 to dial to Sint Maarten will hear a message announcing the new area code).

Note that the northern part of the island, known as Saint Martin is a French Overseas Collectivity and uses country code 590.

See Nanpa announcement and map of the new area code (in PDF)

More geopolitical information on the former Netherlands Antilles

A new area code was announced on June 21, 2011 for the US state of North Carolina. The new area code 984 will overlay (cover the same area) existing NPA 919 starting April 30, 2012. As a result, all local calls in the newly formed overlay area will be dialed using the 10 digit dialing format (919 xxx xxxx or 984 xxx xxxx). The 10 digit permissive dialing period will begin on October 1, 2011 and end on March 31, 2012. During this period, local calls in area code 919 can be dialed in both 7 and 10 digit dialing formats. Starting April 1, 2012 the 10 digit dialing becomes mandatory.

Area code 919 covers the central part of North Carolina with cities such as Cary, Durham, Mount Olive, Oxford, Raleigh.

See NANPA announcement and map of new overlay area (PDF document).

A relief plan was approved back in 2008 for area code 920 of Wisconsin, USA. This area code covers the Eastern part of the state with larger cities such as Green Bay, Oshkosh or Sheboygan. The same geographic area will also be served by the new NPA 274 which will overlay NPA 920 starting March 10, 2012. A longer than usual permissive 10 digit dialing period will start on May 14, 2011 and end on February 11, 2012 when the 10 digit dialing will become mandatory.

See Nanpa announcement and detailed map for the newly introduced overlay area (in PDF)

A 4th area code will be introduced on April 16, 2011 to cover the Bronx/Brooklyn/Queens/Staten Island area of New York City. The new area code 929 will be added to the existing area codes 347, 718 and 917 currently covering this area. There is no need for a permissive 10 digit dialing period since this part of New York City has long had 10 digit mandatory dialing.

See NANPA announcement and map of overlay complex 929/718/347/917 (in PDF format)

A new area code will be introduced to overlay existing NPA 918 covering the eastern part of Oklahoma (Broken Arrow, McAlester, Tulsa). The new NPA 539 will become active on April 1, 2011. The permissive 10 digit dialing period for area code 918 was introduced on August 7, 2010. Mandatory 10 digit dialing will be activated on March 5, 2011.

See NANPA announcement and map of new overlay complex 539/918 (PDF document)

The North Eastern part of Nebraska including communities such as Bellevue, Lincoln, Omaha will have a new area code starting March 26, 2011. The new area code 531 will cover the existing 402 NPA. A permissive 10 digit dialing period for area code 402 was introduced on June 26, 2010 and will end on February 26, 2011. During the permissive period all local calls within area code 402 can be dialed either in the 7 or 10 digit format. Starting February 26, mandatory 10 digit dialing will be activated.

See NANPA announcement (PDF document)