Long Hill Township was formed as Passaic Township in 1866.  In November, 1992 the voters elected to change the name of the municipality to Long Hill.

Long Hill was named one of 25 Great Towns by New Jersey Magazine in March, 1999.

The Township consists of four communities: the villages of Gillette, Millington and Stirling, and the hamlet of Meyersville.  Homestead Park is the name of the first subdivision in the Township developed in the 1920's.

Long Hill Township is located in the most southern part of Morris County, New Jersey.  It is bounded by the Passaic River on the south and west, and by the Great Swamp National Wildlife Refuge on the north.  It borders both Union and Somerset Counties.

In colonial times, Long Hill Township was part of the "Lord Stirling Grant" that included much of the area from Summit to Bernardsville, between Morristown and Watchung.

Long Hill Township has a Township Committee form of government.  Five members of the Township Committee are elected for staggered three-year terms.  The Committee elects a Chairperson to serve as Mayor for one year.