FNB Field is a baseball park in Harrisburg, Pennsylvania, on City Island in the Susquehanna River. It is the home field of the Harrisburg Senators, the Double-A Eastern League affiliate of the Washington Nationals, and was the home stadium of Penn FC of the USL. The original structure was built in 1987 and it was called Riverside Stadium until 2004. It has a capacity of 6,187. The ballpark received a $45 million renovation that began in 2008.