We are staying at Fairfield Inn where is the closest laundromat?
There is the Super Laundromat at 80 Summer St that looks fairly close.
You can go over the Fairhaven bridge (Route 6, also known as Huttleston Ave) and there is one less than a mile on your right. It's less than 10 minutes from where you are. It's a Delken. You'll see if next to a store called Benny's.
Here are three close enough to where you are staying. All are in Fairhaven and less than 10 minutes away. Tumbletime Laundry 7 Howland Rd. It's fairly new. Seabreeze Laundry 235 Main St. and Delken 3 People's Way. All easy to get to.