Mullica Hill is a census-designated place (CDP) and unincorporated community located within Harrison Township, in Gloucester County, New Jersey, United States. As of the 2010 United States Census, the CDP's population was 3,982.
Spicerville was the name of a village on the south bank of Raccoon Creek, named after prominent landowner Jacob Spicer. Mullica Hill originally referred to the village on the north bank of Raccoon Creek, named after the sons of Eric Pålsson Mullica, whose sons William, Eric, Olag and John Mullica began purchasing land here in 1704. Eventually, both villages became known as just Mullica Hill as the original name of Eric's grandfather's house in the Middle of Finland "Mullikkamäki" (mäki means hill). Some of Mullica Hill's historic buildings were built following the Civil War, notably the town hall that still stands today. The period of industrial and agricultural growth during and after the Civil War is commemorated by a reenactment every fall. In 1991, the entire village was placed on the National Register of Historic Places as the Mullica Hill Historic District.
According to the United States Census Bureau, the CDP had a total area of 3.626 square miles (9.392 km2), including 3.603 square miles (9.333 km2) of land and 0.023 square miles (0.059 km2) of water (0.63%).
The 2010 United States Census counted 3,982 people, 1,456 households, and 1,104 families in the CDP. The population density was 1,105.1 inhabitants per square mile (426.7/km2). There were 1,502 housing units at an average density of 416.8 per square mile (160.9/km2). The racial makeup was 92.87% (3,698) White, 3.84% (153) Black or African American, 0.08% (3) Native American, 1.33% (53) Asian, 0.00% (0) Pacific Islander, 0.45% (18) from other races, and 1.43% (57) from two or more races. Hispanic or Latino of any race were 3.16% (126) of the population.
Of the 1,456 households, 38.0% had children under the age of 18; 62.5% were married couples living together; 10.8% had a female householder with no husband present and 24.2% were non-families.