Area code 920 is a telephone area code in the North American Numbering Plan (NANP) for a large area of eastern Wisconsin. The area code was created on July 26, 1997, in a split from area code 414, one of the original North American area codes of 1947. Area code 274 is scheduled to be overlaid with 920 on May 5, 2023. History When the American Telephone and Telegraph Company (AT&T) divided the North American continent into the original eighty-six numbering plan areas (NPAs) for a nationwide telephone numbering plan, Wisconsin received two area codes, in 1947, area code 414 for the south and northeast, and 715, for the northern part. On November 22, 1996, Ameritech notified Bellcore, the North American Numbering Plan Administration (NANPA), that demand for telephone numbers had rapidly increased in the eastern part of the state, so that a jeopardy condition existed in which mitigation could not provided early enough to avoid exhaustion of the numbering pool. On January 15, 1997, the NANP announce a split of the numbering plan area to create the new area code 920, in which Milwaukee and the surrounding communities south of the city would retain the existing area code, and the northern portion of the numbering plan area would receive 920. The split became effective on July 26, 1997, and a permissive dialing period ended on October 25, 1997. In 2008, service providers recognized the need for a second area code for northeastern Wisconsin, leading the Public Service Commission of Wisconsin to approve an overlay plan with new area code 274. The effective date for the new area code was announced as March 10, 2012. However, on December 22, 2010, PSC ordered a postponement of the plan due to new exhaustion forecasts for 2014. The Great Recession, number porting, a decline in landlines, and other factors delayed that requirement for fifteen years during which implementation was deferred several times. Prior to October 2021, area code 920 had telephone numbers assigned for the central office code 988. In 2020, 988 was designated nationwide as a dialing code for the National Suicide Prevention Lifeline, which created a conflict because area code 920 permitted seven-digit dialing. 920 transitioned to ten-digit dialing on October 24, 2021. On December 8, 2008, the Public Service Commission finally approved an all-services distributed overlay as the relief method for NPA 920 and on March 16, 2022, the NANPA