A slice of Middletown's rich historic heritage remains intact today and is prominently displayed within the two historic districts. The South Main Street District contains the Sorg Mansion and
Recently the Middletown City Council designated the Highlands Historic District which contains a rich variety of architectural styles constructed mostly in the early 20th century. The district contains the original homes of many of Middletown's most prominent merchants and industrialists.
In 1978, the City adopted the Historic Preservation Plan, a framework under which any variety of needs and interests involving historic preservation can fit into some course of action. This plan provides guidance and direction to the interest of preserving the heritage of Middletown.