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The Hanover Park area was originally settled in the 1820's as Ontarioville by settlers from Indiana. Prior to 1854 farmers depended on agriculture to support their families. Phineas H. Smith started shipping milk from his dairy to Chicago by way of an ox team. This started a shift from farming to dairying.
Ten years later cheese factories appeared. Other businesses included three creameries. The main form of public transportation was a stagecoach line that carried people as far as Galena.
In 1872 the Chicago & Pacific Railroad reached the town after land was donated for the construction of a depot, bringing residents access to the Midwest states. New homes were being constructed by Edwin Bartlett in 1874, and a few years later the town was thriving.
After World War II, the area grew rapidly, and to prevent encroachment from surrounding towns, Ontarioville was incorporated in 1958 as Hanover Park, named after Hanover, Germany. The population then was 305, and the land area was less than a square mile. Over the years growth has continued, with the village now encompassing six square miles with a population of over 37,000 people.