Cliffwood is an unincorporated community located within Aberdeen Township in Monmouth County, New Jersey, United States. The area is served as United States Postal Service ZIP code 07721.As of the 2010 United States Census, the population for ZIP Code Tabulation Area 07721 was 2,974.Cliffwood is located southwest of Route 35 and is bounded by Matawan on the south and Old Bridge Township on the northwest. Matawan Creek borders Cliffwood to the southeast. River Gardens, a community along Matawan Creek, is served by Zip Code 07735.Cliffwood, as a part of Aberdeen, is served by the Matawan-Aberdeen Regional School District. The MARSD Central Offices are located at 1 Crest Way, in Aberdeen.Cliffwood is home to Cliffwood Elementary School. On January 26, 1855, tobacco magnate David Hunter McAlpin sold 0.5 acres of land for $50.00 to the Trustees of the Matavan School District No. 1. for school purposes. This remains a part of the campus of the Cliffwood Elementary School. The Matawan Aberdeen Middle School is also