- Warren Island
- Washburn
- Washburn Junction
- Washington
- Washington Junction
- Water Island
- Waterboro
- Waterboro Center
- Waterford Flat
- Waterloo
- Waterville
- Wattlebury Island
- Wattons Mill
- Waukeag
- Waverley
- Wayne
- Wayside Trailer Park
- Webb Hill
- Webber Island
- Webster
- Webster Corner
- Weeks Corner
- Weeks Mills
- Weeks Mills
- Weeksboro
- Welchville
- Weld
- Weld Corner
- Wellington
- Wells