Saw this mentioned in the Big Wreck thread, very handy database. It certainly doesn't contain everything ever recorded, but it is very comprehensive.
Album list - Dynamic Range Database
It is interesting to note that while Vinyl is largely an obsolete format, it has some benefits, especially when it comes to metal. If they do a separate vinyl mix it often has better dynamic range. Whether it's enough to actually hear, or is worth the other limitations of the format are up to the listener, but for albums that have a dedicated vinyl mix or dedicated vinyl remaster, the dynamic range is usually slightly better. Mainly due to the physical limitations of vinyl and the cutting of grooves and all that, funnily enough, not really a stylistic choice to make the vinyl more DR'd most of the time.
You can also always download software yourself to find it, if you have the original media. These are user submitted. But very trustworthy, people that care about shit like DR tend to be quite precise. If you care enough to measure the DR of your media, chances are you know how to do it right. If you do it wrong, odds are the other DR obsessed freaks will catch you anyways.
I believe the commonly accepted scale for DR is 1-20, higher being better, the site only goes up to 14+ though, which is sensible, because even if you can hear those frequencies, odds are you don't have a nice enough set up to convey them.
Also worth noting that you have to own the media yourself to accurately calculate it, trying to discern DR on something like terrestrial radio (the worst offender) is pointless, because radio stations run their own aggressive limiters on the signal they broadcast. (no idea if satellite radio does the same thing, not a satellite radio guy). As far as things like youtube algorithms go, that's a whole other discussion.