[4] The urban center of the town is the Thomaston census-designated place, with a population of 1,928 at the 2020 census.

Terry brought mass production to the clockmaking industry, helping to reduce the cost of clocks.

[8] The name derives from Seth Thomas, the early clockmaker, who established a factory in town in 1812.

[6]: 60  [8] The Seth Thomas clock factory building still exists; however, the clockmaking industry has long since left the state as well as the country.

[9] The town is located at the confluence of the Naugatuck River, Northfield Brook and Black Rock Brook, and is protected by U.S. Army Corps of Engineers flood control dams on each of these watercourses.

These were all constructed in the years immediately following the devastating flood of 1955 which ravaged the town as well as the state in general.

The Route 8 expressway runs along the Naugatuck River in the eastern part of town and has three exits in Thomaston.