The Jefferson Township Fair, located in Mercer, PA is a small, volunteer run fair. The Jefferson Township Fair does not charge for general admission, or parking. The fair is here for individuals, and families alike to come and enjoy some of the areas finest livestock, exhibits, and food - if you check out our food stands, you will know why everyone always talks about them! The Jefferson Township Fair takes a lot of pride in itself, we are able to have volunteers work all week at our fair, because of the publics continued support over the years. We encourage you to come check out the Annual Jefferson Township Fair.