Its a small portion of the market, but these are the most popular manual models.
In the United States, over 90% of new cars and light trucks are sold with an automatic transmission. Clearly, Americans just don't see the appeal of rowing their own gears. Few cars even offer a manual anymore, and the ones that do make up just a small portion of the market. However, there are a few cars with manuals that do sell well, and it isn't that hard to see why. None of the top five selling manual cars in the US are specialty sports cars like a Porsche or BMW. In fact, all of them are just three pedal versions of normal family cars.
Of the top five, Honda manages to get two cars on the list, while Toyota, Ford, and Nissan capture the other three. The Ram 2500 and 3500 would make the list at number one, but many of them are used commercially and can't be counted here.