Since Mattapoisett is part of the Providence/New Bedford market, you're sure to generate many more replies if you were to re-post your search for information over on the Providence board.
Anyway....Here's my two cents.
For what passes for oldies and classic hits around here, you've really only got "B-101" (WWBB 101.5, Providence), and WODS 103.3 in Boston.
There's also a locally produced brokered-time program on Sunday mornings, 10 am to 1 pm, over on suburban AM station WARL-1320. The program, called "Guido & the Doo-Woppers" features music from the very early years of Rock & Roll, as well as harmonies and Doo-Wop.
For stations still doing "live and local" radio....both 630-WPRO in Provdence and 1480-WSAR in Fall River do very lively local news-talk formats, and probably come closest to giving you a real flavor of what the area is like.
If you're into sports....then you HAVE to check out Boston's WBZ-FM 98.5 ("The Sports Hub").
Hope this helps a bit. As I mentioned before....try posting again over on the Providence board, where your search for help will get better exposure.