Jimmy128 said:
Zak, here's what is on HD
http://www.hdradio.com/stations/Massachusetts-MA/Boston-11
This is a fairly accurate list.
It's fairly complete and accurate except for the following:
88.9 WERS HD2 is not AAA, it's Broadway and show music.
89.7 WGBH HD1 no longer has classical (Cls) included in its programming.
89.7 WGBH HD2 is classical, but note that it's a rebroadcast of 99.5 WCRB.
89.7 WGBH HD3 is a rebroadcast of WCAI/WNAN on the Cape and Islands.
91.7 WNEF HD1 is no longer strictly folk, it's now folk/roots-leaning AAA.
91.9 WUMB HD1 see WNEF HD1 above.
92.9 WBOS HD2 is no longer "Radio You". It's automated modern rock/AAA.
103.3 WODS HD1 is no longer Oldies, it's a Classic Hits format.
103.3 WODS HD3 is "Mercy Rock", contemporary Christian rock/pop
There are no other HD FM stations or subchannels in metro Boston, so don't ask about any other stations! Any other Boston area FM stations not listed at the HD radio link, or in my revision here, are not broadcasting HD.
AM:
800 WNNW I have heard no longer broadcasts HD. I don't live close enough to tell.
1200 WXKS has never broadcast in HD as far as I have heard.
Former HD station:
1090 WILD very briefly broadcast in HD in the mid-2000s.
There are no other current or former HD AM stations in metro Boston.