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is a city in Alameda County, California, United States. As of the 2008 census, the current population is about 73,402. Union City was incorporated in 1959, bringing together the communities of Alvarado, Decoto, and New Haven. Alvarado was the original county seat of Alameda County in 1853, and the site of the first county courthouse is a California Historical Landmark (#503).
Union City celebrates its 50th anniversary in 2009, with a year of events planned for the community.
The San Francisco Bay Area Flight 93 Memorial is in Sugar Mill Landing Park. It was the first monument completed in the United States which was designed specifically to honor the passengers and crew of United Airlines Flight 93, which was bound for San Francisco, but was hijacked and crashed in rural Pennsylvania on September 11, 2001.
According to the United States Census Bureau, Union City has a total area of 49.9 km² (19.3 mi²), all relatively flat land with no significant body of water. The Niles Cone aquifer, managed by the Alameda County Water District, supplies much of the water consumed by the city. Hayward borders the city to the north and Fremont to the south. Union City, Newark, and Fremont form the Tri-City area.