Westford is a town in Middlesex County, Massachusetts, United States. The population was at 24,643 at the time of the 2020 Census. Westford began as 'West Chelmsford,' a village in the town of Chelmsford. The village of West Chelmsford grew large enough to sustain its own governance in 1729, and was officially incorporated as Westford that …Westford is a town in Middlesex County, Massachusetts, United States. The population was at 24,643 at the time of the 2020 Census. Westford began as 'West Chelmsford,' a village in the town of Chelmsford. The village of West Chelmsford grew large enough to sustain its own governance in 1729, and was officially incorporated as Westford that year on September 23.