Trenton Thunder Ballpark, formerly known as Mercer County Waterfront Park and Arm & Hammer Park, is a ballpark in Trenton, New Jersey. It is the home park for the Trenton Thunder, a collegiate summer baseball team of the MLB Draft League. They were previously a Double-A level Minor League Baseball team of the Eastern League (1994–2020). For 2021, it served as temporary home of Triple-A East's Buffalo Bisons, as their regular stadium, Sahlen Field, was being used by the Toronto Blue Jays due to travel restrictions brought on by the COVID-19 pandemic. The official seating capacity is 6,440.