Bergen was a city that existed in Hudson County, New Jersey, United States, from 1855 to 1870.
Bergen was originally incorporated as a town by an Act of the New Jersey Legislature on March 24, 1855, from portions of Bergen Township. In 1862, it did a reverse takeover, absorbing the remaining portions of Bergen Township. On April 14, 1863, portions of the town were taken to form Greenville Township. Bergen was reincorporated as the City of Bergen on March 11, 1868:
In 1866, Library Hall was built and served as the town hall for Bergen Township, then later as Bergen City, before annexation. Library Hall has been preserved and is now a residential building.
On May 2, 1870, both Bergen City and Hudson City were annexed by Jersey City. Bergen City roughly corresponds with the southern part of Journal Square, part of the West Side (West Bergen) and the Bergen-Lafayette neighborhoods.