Colchester has three voting districts for representation to the Vermont House of Representatives: CHI-20 known as 'The Village Side' and CHI-19 known as 'The Bay Side'. Colchester also has two Senatorial Districts, the Grand Isle District which includes most of the town and all of Grand Isle and the Chittenden Central District, which includes the area of Colchester known as 'The Fort' as well as Winooski, portions of Essex and portions of Burlington. The Vermont Senatorial district for this area consists of the two house districts and Grand Isle.
If you aren't sure which district your neighborhood is in,, you can always call the Colchester Town Clerk's office at (802) 264-5520 and ask.
Here are maps of the districts:
House of Representatives CHI-19
House of Representatives CHI- 20
Senate Chittenden Central District