Located within Blackstone Valley, the population in Millbury was 13,831 at the 2020 United States Census.

Because traveling from one part of the town to the other for meetings was time-consuming, inhabitants of the North Parish petitioned the Massachusetts General Court to split Sutton.

The Blackstone River flows through the town, and during the Industrial Revolution, provided water power to its many textile mills and factories.

Millbury's industrial history begins in the early eighteenth century, not long after the area's settlement.

[3] In the late eighteenth and early nineteenth centuries, after learning the trade of firearms production from their father, Asa Waters and his brother, Elijah, purchased land along the Blackstone River and built mills producing goods such as guns, scythes, and sawmill equipment.

Designed by local architect Asher Benjamin, it was completed six years later.

He visited his aunt, Delia C. Torrey, during his presidency to celebrate Millbury's centennial.

A propane plant near Route 146 exploded, causing considerable damage and making nationwide news.

The local Vaillancourt Folk Art designed chalkware for the celebration.

[citation needed] Millbury has three sites on the National Register of Historic Places: As of the census[17] of 2020, there were 13,831 people, 4,927 households, and 3,443 families residing in the town.