High Quality Content by WIKIPEDIA articles! Salisbury Factory Building is a historic building at 25 Union Street in Worcester, Massachusetts. It was built in 1879 and added to the National Register of Historic Places in 1980. Worcester is a city in Worcester County, Massachusetts, United States. Named after Worcester, England, the city's last census population was 172,596 (2000), making it the estimated third largest city in New England. The 2009 estimate for the city's population was 182,882, which would make it the second largest city in New England overtaking nearby Providence. It is the county seat of Worcester County. Worcester is located approximately 40 miles (64 km) west of Boston, and marks the western periphery of the Boston-Worcester-Manchester (MA-RI-NH) U.S. Census Combined Statistical Area (CSA) (Greater Boston).