Brockton is a city in Plymouth County, Massachusetts, United States; the population was 93,810 in the 2010 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 are Montello and Campello, both have the distinction of having their own MBTA Commuter Rail Stations and post offices. Campello is the smallest neighborhood in the city, but the most populous. Brockton hosts a baseball team, the Brockton Rox.