Gillette is in southern Morris County, in the eastern third of Long Hill Township. It is bordered to the west by Stirling, also within Long Hill Township; to the north by Harding Township; and to the east by Chatham Township. The community's southern border is the Passaic River, across which is Union County to the southeast and Somerset County to the southwest.
The unincorporated community of Gillette is in the southern part of the Gillette CDP; Meyersville is in the northern part. The two settled areas are separated by Long Hill, summit elevation 450 feet (137 m), which rises about 200 feet (61 m) above the neighboring valleys. Morristown, the county seat, is 10 miles (16 km) to the north, while downtown Newark is 17 miles (27 km) to the east. Interstate 78 passes less than 2 miles (3 km) to the south of Gillette, with access from Exit 40, Hillcrest Road.
According to the U.S. Census Bureau, the Gillette CDP has a total area of 4.465 square miles (11.564 km2), of which 4.323 square miles (11.197 km2) are land and 0.142 square miles (0.368 km2), or 3.18%, are water.[1] The entire CDP is within the watershed of the Passaic River leading to Newark Bay.
Gillette, New Jersey – Racial and ethnic composition Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.
^Matthew G. Kantor Memorial Park, Long Hill Township. Accessed July 30, 2019. "On Veteran's Day 2013 (11/11/13), the park was officially dedicated and renamed Matthew G. Kantor Memorial Park to honor Matthew, a resident of Long Hill and Navy Seal who lost his life while serving in Afghanistan in November 2012."
^Bruce, Scott. "Jessie Baylin Leaves Her Mark"Archived June 30, 2015, at the Wayback Machine, movmnt, December 11, 2008. Accessed September 19, 2014. "But success wasn't exactly buzzing around the corner of her hometown, Gillette, New Jersey. Like many an artist, Baylin had to pull herself from the comforts of home and set out on a journey that sent her California bound."