Ogdensburg is a borough in Sussex County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 2,258, a decrease of 152 from the 2010 census count of 2,410, which in turn reflected a decline of 228 from the 2,638 counted in the 2000 census. The borough was formed based on an Act of the New Jersey Legislature on February 26, 1914, from part of Sparta Township, subject to the results of a referendum held on March 31, 1914.