Hewitt is an unincorporated community and census-designated place (CDP) located within West Milford Township in Passaic County, in the U.S. state of New Jersey. The area is served as United States Postal Service ZIP Code 07421. It is named for Abram Hewitt. As of the 2020 census, Hewitt had a population of 1,912.
Hewitt was first listed as a census designated place in the 2020 U.S. census.
As of the 2010 United States census, the population for ZIP Code Tabulation Area 07421 was 7,439.