Colonia is an unincorporated community and census-designated place located within Woodbridge Township, in Middlesex County, New Jersey. As of the 2010 United States Census, there were 17,795 people living within Colonia's 3.9 square mile area.

Colonia's Merrill Park is located on 179 acres along the south branch of the Rahway River. It has 4 tennis courts, 3 baseball fields, a soccer field, 7 picnic groves that can be reserved in advance, the progressive playground, an animal haven, a football field, 2 basketball courts, 2 softball fields, 2 open picnic groves, and 3 other playgrounds. The football field and soccer field are surrounded by a walkway for joggers, and there are numerous small trails around the park.  The park's animal haven has pigs, goats, peacocks, horses and other animals and birds. It  is free and there is no charge to view the animals.

Public schools in Colonia, operated as part of the Woodbridge Township School District, include 3 elementary schools, Colonia Middle School (grades 6 - 8), and Colonia High School. St. John Vianney Grammar School is a private school located on Inman Avenue in Colonia.


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