Ohio's 'Glass City' is Toledo, a city located in northwest Ohio on the western end of Lake Erie. It is the fourth most populous city in the state and the county seat of Lucas County. The city is known for its glass industry, which dates back to the 19th century. Toledo has been nicknamed the Glass City due to its long history of glass production and its many glass-related businesses. The city is also home to the University of Toledo and the Toledo Museum of Art.