Chelmsford is a town in Middlesex County, Massachusetts in the Greater Lowell area. As of the 2010 United States Census, the town's population was 33,802.
Settlers from the adjacent communities of Woburn and Concord founded Chelmsford. An act of the Massachusetts General Court in the last week of May 1655 town incorporated Chelmsford, and it was named after Chelmsford, England. The nearby communities of Groton and Billerica were incorporated at the same time. Chelmsford originally contained the neighboring town of Westford, and parts of Carlisle, Tyngsborough, and a large part of Lowell (formerly known as East Chelmsford). Both the Middlesex Canal and Middlesex Turnpike, major transportation routes, were built through Chelmsford in the first part of the 19th century.Chelmsford was the birthplace of the Chelmsford Spring Co. in 1901, which later became the Chelmsford Ginger Ale Company, acquired by Canada Dry in 1928. The ginger ale plant, rebuilt in 1912 after a disastrous fire consumed the original plant, stood on Route 110 until its demolition in 1994. The Chelmsford brand of golden ginger ale continued to be manufactured by Canada Dry for decades. It is currently manufactured by Polar Beverages for DeMoulas/Market Basket supermarkets, based out of neighboring Tewksbury.