Union City, New Jersey
Union City is a city
City (New Jersey)
A City in the context of New Jersey local government refers to one of five types and one of eleven forms of municipal government....

 in Hudson County
Hudson County, New Jersey
Hudson County is the smallest county in New Jersey and one of the most densely populated in United States. It takes its name from the Hudson River, which creates part of its eastern border. Part of the New York metropolitan area, its county seat and largest city is Jersey City.- Municipalities...

, New Jersey
New Jersey
New Jersey is a state in the Northeastern and Middle Atlantic regions of the United States. , its population was 8,791,894. It is bordered on the north and east by the state of New York, on the southeast and south by the Atlantic Ocean, on the west by Pennsylvania and on the southwest by Delaware...

, United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. According to the 2010 United States Census the city had a total population of 66,455. All of the city is on land, an area of 1.27 square miles (3.3 km²). As of the 2000 Census it was the most densely populated city in the United States, with a density of 52,977.8 per square mile.

Union City was incorporated as a city by an Act of the New Jersey Legislature
New Jersey Legislature
The New Jersey Legislature is the legislative branch of the government of the U.S. state of New Jersey. In its current form, as defined by the New Jersey Constitution of 1947, the Legislature consists of two houses: the General Assembly and the Senate...

 on June 1, 1925, with the merger of Union Hill
Union Hill, New Jersey
Union Hill is a section of Denville Township in Morris County, New Jersey, United States. The Union Hill section comprises the southernmost part of Denville and is mostly south of Route 10. Although one of the oldest settled parts of Denville, it is characterized by having the most recent housing...

 and West Hoboken Township
West Hoboken, New Jersey
West Hoboken was a municipality that existed in Hudson County, New Jersey, United States, from 1861 to 1925.West Hoboken was originally incorporated as a township by an Act of the New Jersey Legislature on February 28, 1861, from portions of North Bergen Township. The township was reincorporated on...