Columbia, NJ is currently using one area code which is area code 908. Area code 908 was created from a split of area code 201 and put into service on November 1, 1990.
In addition to Columbia, NJ area code 908 serves west-central New Jersey, including the larger communities of Berkeley Heights, Cranford, Elizabeth, Linden, Plainfield, Roselle, Scotch Plains, South Plainfield, Summit, Union, Warren, Washington, and Westfield in addition to many smaller communities within the service area.
Columbia, NJ is located in Warren County and observes the Eastern Time Zone. View our Times by Area Code tool.