A large number of books written in German are purchased for the large German-speaking population. In June 1920, the Parent-Teacher Public Library of Milltown is organized. The federal government establishes Milltown's first official post office. The phone comes to Milltown. New Jersey Rubber Shoe Works and Meyer Rubber Works are the first customers.
Citizens approve secession from North Brunswick.
On Oct. 22, a special election is held to form a Borough Commission and to set town boundaries. A Board of Commissioners to lead the town is chosen, and they are sworn in on March 16. The first formal complaint is brought before the commissioners. Boys playing ball in the neighborhood of Clay and Church streets are making too much noise. The first passenger train of the Raritan River Railroad Company, operating between New Brunswick and South Amboy via Milltown, is given its first run.