From the Mercer County Fair website:

The Mercer County Fair has been important to the residents of Mercer County since its first fair in 1853. Today, 172 years later, the fair still brings the county together each July. We are a small county, with only 15,000 residents, yet over 11,000 visit our fairgrounds each summer. Our exhibitions, from livestock to hobbies, antiques, photography, to culinary arts, flowers, and vegetables, allow a large number of our people to enter the competitions.