
The Norfolk Southern Railway's Lehigh Line, formerly the mainline of the Lehigh Valley Railroad with a mix of mainline trackage combined long leased to the Central Railroad of New Jersey by its builder Lehigh Coal & Navigation Company, runs through Phillipsburg and then across the Delaware River into Easton, Pennsylvania. As of the 2020 United States census, the town's population was 15,249, an increase of 299 (+2.0%) from the 2010 census count of 14,950, which in turn reflected a decline of 216 (−1.4%) from the 15,166 counted in the 2000 census. Phillipsburg is a town located along the Delaware River that is the most populous municipality in Warren County, in the U.S.
