Elizabeth is a city in and the county seat of Union County, in the U.S. state of New Jersey. As of the 2020 United States census, the city retained its ranking as the state's fourth-most-populous city behind neighboring Newark, Jersey City and Paterson, with a population of 137,298, an increase of 12,329 (+9.9%) from the 2010 census count of 124,969, which in turn reflected an increase of 4,401 (3.7%) from the 120,568 counted in the 2000 census.