Mathewson Playground Mathewson Playground is located in Plainfield, NJ. There is a Playground and a Basketball Court. Park FeaturesBasketball Court(s)Playground E 4th St Plainfield , New Jersey 07063 United States Get Directions 908-753-3097 Website Category: Parks and Public Facilities Tags: Basketball Court and Playground Previous Next Park Features: Basketball Court(s)PlaygroundTags: Basketball Court and PlaygroundCategory: Parks and Public Facilities E 4th St Plainfield , New Jersey 07063 United StatesPhone: 908-753-3097Email: recreation@plainfieldnj.govWebsite