 In a referendum held on June 9, 1931, Midland Park acquired additional land from Wyckoff Township (which until 1926 had been known as Franklin Township).The borough says that Midland Park was named after the New Jersey Midland Railway, which operated the railroad passing through the area of the borough in the 1870s, though elsewhere the name is said to be based on being situated "amid Bergen hills".According to the United States Census Bureau, the borough had a total area of 1.563 square miles (4.049 km2), including 1.555 square miles (4.028 km2) of land and 0.008 square miles (0.021 km2) of water (0.52%).