'''Union City''', [[New Jersey]], is the most densely populated city in the [[United States]]. As of 2000, it included 60,000 people in an area of only 1.3 square miles. | '''Union City''', [[New Jersey]], is the most densely populated city in the [[United States]]. As of 2000, it included 60,000 people in an area of only 1.3 square miles. |