Jersey City, NJ utilizes an area code overlay in which area codes 201 and 551 serve the same geographic area. The area code overlay which is in use today was established in 2001 at which time area code 551 was created as an overlay of area code 201. Area code 201 originally covered the entire state of New Jersey when it was established in 1947. Ten digit dialing (area code + seven digit number) is necessary because two different homes in the same geographic area can have the same seven digit phone number but each would have a different area code.
In addition to Jersey City, NJ area codes 201 and 551 serve northeastern New Jersey including the larger communities of Bayonne, Bergenfield, Cliffside Park, Englewood, Fair Lawn, Fort Lee, Hackensack, Hoboken, Jersey City, Kearny, North Bergen, Paramus, Ridgewood, Teaneck, Union City and West New York, NJ in addition to many smaller communities.
Jersey City, NJ is located in Hudson County and observes the Eastern Time Zone. View our Times by Area Code tool.