Mount Hermon is an unincorporated community and census-designated place (CDP)[9] located within Hope Township in Warren County, in the U.S. state of New Jersey,[10] that was defined as part of the 2010 United States Census.

[1][2] The 2010 United States census counted 141 people, 50 households, and 38 families in the CDP.

There were 54 housing units at an average density of 116.9 per square mile (45.1/km2).

The racial makeup was 95.74% (135) White, 0.71% (1) Black or African American, 0.00% (0) Native American, 2.13% (3) Asian, 0.00% (0) Pacific Islander, 0.71% (1) from other races, and 0.71% (1) from two or more races.

Of all households, 20.0% were made up of individuals and 10.0% had someone living alone who was 65 years of age or older.