While I can’t speak to the rest of the nation, I can’t recall the last time I went to any sizable supermarket in the US (mostly on the East Coast, with some Midwest and West coast urban experience) that had any less than two dozen types of cheese. I’m not talking about upscale specialty stores (which tend to have far more), but the largest chains in their respective regions - i.e. the stores most commonly shopped by middle class or blue collar families (vs. the convenience shops where many younger people shop)
I suspect the problem is that US supermarkets heavuly segregate and target various cheese types, as part of the prevailing marketing model. For example, bif companies like Kraft pay big bucks to have their processed cheese food placed by the milk to wordlessly create a product association as a natural healthy product. You’ll often find butter, cream cheese, and cheeses packaged in tubs (e.g. ricotta) there as well, but a second section, either in a different cooler or a distance away, usually contains the at least half dozen standard ‘real cheeses’ : mozzarella, ricotta, swiss (most of the world’s ‘imported swiss’ cheese is made in Finland, most unspecified swiss cheese is domestic), cheddar, monterrey jack, colby, feta, provolone, and a few others which vary by store and region. ‘Soft cheeses’ like brie and camembert, and their processed equivalents like laughing cow, bonnebel, etc. are often placed separately from the harder cheeses. The Delicatessen selection (which might have slipped you mind) almost always sells at least a dozen cheeses, and generally more. Nonrefrigerated cheeses (parmesan, romano, etc) and cheese products (Cheese Whiz, Velveeta cheese blend, various snack packs and novelty cheese products, etc.) are often found on the shelves, particularly near the pasta section and snack food sections, respectively. In recent years, almost all large supermarkets in the Northeast US (and most urban centers) also have a separate ‘gourmet cheese’ case or display, a treasure trove that many shoppers automatically tune out
That’s just scratching the surface. I’m, sure that if I thought about it, I could think of several other places cheese is stashed in a typical US store migh stash cheese. Often cheeses are placed according to packaging type or manager whim -e.g. some managers consider feta ‘exotic’ and place it with the gourmet chesses, others place it alongside the cream cheese or mozzarella cheese.