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The Great Allentown Fair is an annual fair and agricultural show that is held at the Allentown Fairgrounds in Allentown Lehigh County Pennsylvania in the United States. It is operated by the Lehigh County Agricultural Society. It is one of the oldest fairs in the United States and one of the largest in the state of Pennsylvania.The fair was first held in 1852 to showcase agricultural advancements and to entertain patrons.