The Harrisburg Senators are a minor league baseball team based in Harrisburg, Pennsylvania. The team, which plays in the Eastern League, is the AA affiliate of the Washington Nationals. The Senators play in Commerce Bank Park, located on City Island in Harrisburg; originally opened in 1987 as Riverside Stadium, the stadium seats 6,302 fans. The "Senators" nickname refers to the host city being the capital and thus home of the Pennsylvania legislature. The team colors are red, navy blue, and gold, the same colors of the parent club, the Washington Nationals.