Last I checked, there were only 5 courses in North America that fit the proper definition: Pacific Dunes, Bandon Dunes, Old Macdonald, Cabot Links, Highlands Links in Massachusetts. I assume Sheep Ranch counts also, so that is 6. I am sure there are other courses that are close, but I remember reading these 5 (now 6) are the only ones that fit the proper definition.
With that being said, I've seen quite a few courses that seem to be very linksy. Kittansett for one, but perhaps is closer to a British heathland style. I am a little surprised Maidstone doesn't count, although I have not been there.
I have always thought Highlands (MA) had a pretty weak case -- it's on big, rolling land well above the sea. I think it was included only so that they wouldn't be including Bandon alone. Gearhart would have been a better choice if they just wanted an extra entry, but I suppose it had too many trees on it to be considered back then.
Maidstone has a few holes that would certainly be called links, but it's only about half the golf course. [I don't know how many links holes you need, to be a links. There are many with less than 18 -- Golspie, Cullen, Cruden Bay, etc.] Prouts Neck in Maine has several links holes, too.
For my money, Ballyneal and Sand Hills and Dismal River should be classed as links courses. The geomorphology is ancient, but it is all sandy land fit only for grazing animals, the playing surfaces are fescue, there aren't any trees, and you have the classic windy conditions normal to links courses. Yeah, they're 1000 miles from the ocean now, but they play like the real thing.
P.S. I agree that The Loop plays like a links but I wouldn't call it one; the soil is kind of gravelly. Same for Erin Hills.