LP stores in Portland, Maine

Bull Moose. 

It's been 30 years since I visited their stores but the music they recommended and sold has always been a favorite of mine.

https://www.bullmoose.com

Perhaps they have a location near you. 

 there is a Bullmoose in Brunswick. Great store, not sure about Portland

Last time I was there, about 7 years ago, most of the local shops that I had visited earlier had disappeared.  I recall only one, at that time and there was little classical. ☹

I was just there a few months ago. I was looking for jazz and classical. 
The only shop that I found that catered to this was Enterprise Records. I spent about 20 mins in there. It’s not a big store. As for the other stores on Congress St, they were generally too eclectic for my tastes and would not return to those if I were looking for classical music. 

@aliu2 

Thanks, that is helpful.  It's suposed to rain next week so hopefully I can kill an hour there