I'll give Crawford that Presque Isle and Norwalk don't exactly scream a uniform, shared New England identity. But I'd add that anything west of the Connecticut River in Connecticut is suspect to begin with. Any place where Yankees caps are on parity with or outnumber Sox caps cannot be New England, by definition. And yes, that
does mean Boston University's campus is technically not in New England.
You basically have 3 subcultures in New England: Coastal, Inland, and Fairfield Connecticut. All three share most cultural norms more than they share with any other American region, although the New York part of CT shares the least. Coastal Rhode Island and Coastal Maine - especially the working fishing towns - are substantially similar. The Berkshires, the Green Mountains, the White Mountains, and Aroostook are all substantially similar.
Boston, despite being on the coast, is the hub connecting all the Coastal and Inland spokes.
It's not nearly as common as Irish, Italian, Portuguese, Acadian, or the Betsy Ross flags, but you will see the Dominion of New England flag fly outside houses, especially in the more rural Inland areas: