Area code 551 is serving North areas of New Jersey. The code was created as an overlay to area code 201 in 2001. New Jersey is North Atlantic state situated in United States. Standard Time Zone for the area is Eastern Time Zone.
Code 551 was added as an overlay to code 201 when the two counties Hudson County and Bergen County required telephone numbers exhaustedly.
Ten-digit dialing became obligatory for both of these areas 201 and 551 even while making local calls. Overlay provides the option of repeating telephone number with different area codes. This is how to increase the combination of telephone numbers by just adding a three digit unique code.
Northern areas of North Jersey are served by four area codes together:
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