Is town a common noun or a proper noun?

The Word 'town' is a common noun, a Word for any town anywhere.

A proper noun is the name of a specific person, place, thing, or a title; for example:

• John Venditto, Town Supersor, Town of Oyster Bay, Oyster Bay, NY
• Town Walk Drive, Hamden, CT
• Keebler Town House Crackers
• "Boys Town", 1938 movie with Spencer Tracy, Mickey Rooney