North Andover is a town in Essex County, Massachusetts, United States. At the 2020 census, the population was 30,915. Native Americans inhabited what is now northeastern Massachusetts for thousands of years prior to European colonization of the Americas. At the time of European arrival, Massachusett and Naumkeag people inhabited the area sout…North Andover is a town in Essex County, Massachusetts, United States. At the 2020 census, the population was 30,915. Native Americans inhabited what is now northeastern Massachusetts for thousands of years prior to European colonization of the Americas. At the time of European arrival, Massachusett and Naumkeag people inhabited the area south of the Merrimack River and Pennacooks inhabited the area to the north. The Massachusett referred to the area that would later become North Andover as Cochichawick.