The villages of Westchester and North Westchester are located within Colchester, as is the reservation of the Golden Hill Paugussett Indian Nation. The town center village, which was previously incorporated as a borough, is a census-designated place.
Colchester Probate Court covers Colchester. Constituted May 29,1 932 from East Haddam. Contains the records of East Haddam from October session, 1741 to May 29, 1832.