Greenwich voters go to the same polling place for every type of election: municipal, state or federal. The actual "voting districts" do change each year, which means there may be more or fewer lines at a polling place. These lines represent the various districts and the different ballot styles in use for each district.
In odd-numbered years (2015, 2017, 2019), Greenwich has elections for municipal candidates only. The voting districts are divided into the 12 RTM Districts).
In even-numbered years (2014, 2016, 2018, 2020), Greenwich has elections for municipal, state, and federal offices. As a result of the once-per-decade redistricting of districts for State Representative, Greenwich has 19 districts for these elections. We achieve this by "splitting" certain districts into different lines so that people get the right ballot. As a result, you may be considered part of "District 11" one year, but "District 11A" next year. The important part, however, is that voters should know they can rely on going to the same polling place every year, no matter what kind of election is taking place.
These maps show the voting districts in use for municipal elections (held in odd-numbered years).