4 Hands Brewing Co. (address and info)
Top-rated brewery: Side Project Brewing
Schlafly and Boulevard represent the old guard (well, not the OLDEST guard when it comes to Missouri breweries, but, you know), and Perennial is perennially (!) fantastic, as is its ascendant offshoot, Side Project. Amid all that, 4 Hands has put itself squarely on the map in a fairly short amount of time, doing a dizzying variety of beers exceedingly well, none of them better than the standout milk stout Madagascar (it's better than the movie!) With the sheer number of special releases, barrel-aged offerings, and collabs these guys do, you'd almost think they have extra appendages or something.
Tamarack Brewing Co. (address and info)
Top-rated brewery: Flathead Lake Brewing Co.
Montana being, you know, Montana, things are pretty spread out, meaning that despite the state putting out some amazing beers, you don't always know where they are (or have the patience to drive 40 hours to get 'em), meaning most breweries could be considered underrated (the ubiquity of Big Sky notwithstanding). But among those underrated breweries, our hearts belong to Lakeside's Tamarack, which has to its name a gold medal English-style IPA to go along with its mysterious black session ale, smoked Scotch ale, and other takes on old-school classics right down to barleywine. There's plenty of room under the big sky, and Tamarack is one of the beacons worth following.