So the store is technically in Fletcher, but because Fletcher doesn't have its own area code, most places in town use either Cambridge or Jeffersonville as the mailing address. The Fletcher is the physical address, either Cambridge or Jeffersonville I'd the mailing, I'm not actually sure which one the store technically uses the area code for.
Steph is right. Our post office burned down years ago, so we get zip codes from surrounding towns and their post offices deliver our mail. My mail comes to Fletcher via East Fairfield. In other words, all of the addresses you have listed are correct, but it's only one building Fletcher General Store. In case you're interested, Jeffersonville is actually a town contained within the boundaries of Cambridge, but has its own post office. Apparently we love government so much that we need to have more layers than most.
Thanks! Your answer is awaiting moderation.