Brockton, Massachusetts Library system. The main library is a Carnegie building and is located at 304 Main Street, and there are two branch libraries. Brockton, Massachusetts Brockton is a city in Plymouth County, Massachusetts, United States; the population was 95,314 in the 2015 Census. Brockton, along with Plymouth, are the county seats of Plymouth County. Brockton is the seventh largest city in Massachusetts and is sometimes referred to as the "City of Champions", due to the success of native boxers Rocky Marciano and Marvin Hagler, as well as its successful Brockton High School sports programs. Two of the villages within the city
Brockton High School to passing at Brockton High than at any other school in Massachusetts. In 2005, 98% of the senior class (850 students) graduated. In 2008 78% of the graduating senior class planned to pursue a college degree. In 2006, Brockton High School was a recipient of the National School Change Award. Brockton High School was one of 7 schools in the United States to receive this award. Out of the seven schools, there were only two high schools. In 2008, Brockton students had a higher level of improvement on the English MCAS than 90% of the Massachusetts high schools. By 2010