Helmetta is a borough in Middlesex County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 2,178, reflecting an increase of 353 (+19.3%) from the 1,825 counted in the 2000 Census, which had in turn increased by 614 (+50.7%) from the 1,211 counted in the 1990 Census. The community was founded by George Washington Helme in the 1880s.
Helmetta was formed as a borough by an Act of the New Jersey Legislature on March 20, 1888, when it was created from portions of East Brunswick Township, based on the results of a referendum held on March 10, 1888. Helmetta's boundary with East Brunswick Township was changed as of March 24, 1897.