The Dempsey Pump House is located at 55 Hamilton Avenue in the Leonardo section of Middletown Township in Monmouth County, New Jersey, United States. The historic pump house was built in 1926 and was also used as playroom and community space. William Dempsey purchased the property in 1920. The township purchased the 5-acre (2.0 ha) site in 2004.[4] It was added to the National Register of Historic Places on April 11, 2024.[2]