Alliance is a city in Stark and Mahoning counties in the U.S. state of Ohio. The population was 22,322 at the 2010 census. Alliance's nickname is "The Carnation City", and the city is home to the University of Mount Union.
The Stark County portion of Alliance is part of the Canton–Massillon Metropolitan Statistical Area, while the small Mahoning County portion is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.
Alliance was founded in 1854 by the merger of three smaller communities called Williamsport (formed in 1827), Freedom (formed in 1838), and Liberty (formed in 1850). A fourth community, Mount Union, was added in 1888. Alliance was incorporated as a city in 1889.