<P> Area codes 201 and 551 are telephone area codes in the North American Numbering Plan in the U.S. state of New Jersey . Area code 201 was the area code assigned to the entire state of New Jersey in 1947, when the North American area code system was formulated . After splits in 1958, 1991 and 1997, it covers the area of most of Hudson and Bergen counties . Major cities in the numbering plan area include Bayonne, Jersey City, Hoboken, Hackensack, Secaucus and Englewood . Area code 551 is an overlay code to the same numbering plan area that was installed in 2001 . </P> <P> Area code 201 was the first - assigned numbering plan area (NPA) code of the original NPAs when AT&T devised the North American Numbering Plan in 1947 . It was also the first area code with Direct Distance Dialing (DDD) service, when in 1951 the first direct - dialed long - distance call was made from Englewood, New Jersey to Alameda, California . </P>

Where is area code 201 located in us
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