Mount Olive Township is a township in southwestern Morris County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 28,886, its highest decennial census count ever and an increase of 769 (+2.7%) from the 2010 census count of 28,117, which in turn reflected an increase of 3,924 (+16.2%) from the 24,193 counted in the 2000 census. Located within the Raritan Valley region, Mount Olive is situated in western Morris County bordering both Sussex and Warren counties along the Musconetcong River.

Roxbury is a township in southwestern Morris County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 22,950, a decrease of 374 (−1.6%) from the 2010 census count of 23,324, which in turn reflected a decline of 559 (−2.3%) from the 23,883 counted in the 2000 census. The township is located approximately 36 miles (58 km) west-northwest of New York City, 27 miles (43 km) west-northwest of Newark, New Jersey and 26 miles (42 km) east of the Delaware Water Gap on the border of New Jersey and Pennsylvania.