If a college does admit by major, it is likely that changing into a more popular major after enrolling will require another admission process (high college GPA and/or competitive admission). So it is best to put down a major you are interested in and which is consistent with the rest of your application.
If your desired major is a more popular one that will have higher competition for admission, then you may have to add colleges where it is less popular, or which are less selective generally.