In most cases, the TOEFL (or the IELTS, or some other proof of English proficiency) is required of students whose first language is not English. That's the underlying reason for requiring the TOEFL (not your citizenship, or where you live, as many people think). The other writers are correct that you should check with each college you're interested in regarding its English-proficiency requirements. Even if English was not your first language, some colleges will exempt you from the TOEFL because you've studied at a school where English is the language of instruction, or exempt you if you make a certain SAT Critical Reading score, or if you've earned a high score on an English AP exam, for example. But if English was not your first language, then it's a good idea to take the TOEFL or IELTS because a) you'll do very well on it if you are a fluent English speaker, and b) one or more of your colleges is likely to require it. Best wishes in your college-application process.