Mullica Hill is a census-designated place (CDP)[9] and unincorporated community within Harrison Township in Gloucester County, in the U.S. state of New Jersey.

Eventually, both communities became known as just Mullica Hill as the original name of Eric's grandfather's house in Central Finland: "Mullikkamäki" (mullikka meaning bull calf and mäki meaning 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.

[15] The area was hit by a strong EF3 tornado on September 1, 2021, with winds of up to 150 miles per hour (240 km/h), produced by the remnants of Hurricane Ida, with multiple homes and farms destroyed.

[5][19] The 2010 United States census counted 3,982 people, 1,456 households, and 1,104 families in the CDP.

[13] Mullica Hill Historic District is a 68-acre (28 ha) national historic district along East Avenue, Woodstown Road, Church, High, Main, Mill, New and Union streets in the community.

It was added to the National Register of Historic Places on April 25, 1991, for its significance in architecture, commerce, industry, community development, and exploration/settlement.

The current school was originally established in 1969, but is part of a local Quaker tradition in the area extending back over 300 years.

[26] New Jersey Transit bus service between Mullica Hill and Philadelphia is available on the 410 route.