Not states - and not all colleges within a state - participate so it's up to you to determine if a college your student is interested in participates in these agreements. Here's a great article that talks about this issue.
"In-state college students have long enjoyed lower tuition rates at public colleges and universities in the United States, largely because their parents paid taxes and thus helped fund the public colleges in their states. As a result, out-of-state students end up paying much more in tuition.
The difference in tuition rates for state residents vs. nonresidents is vast. In fact, out-of-state tuition at four-year public universities in the U.S. costs about 189% more on average than in-state tuition—$27,091 per year versus $9,375—according to the National Center for Education Statistics (NCES). But tuition reciprocity helps even this playing field.
With tuition reciprocity agreements, out-of-state students can pay reduced tuition rates at public colleges in other participating states. Tuition reciprocity is a win-win-win for students, schools and states: Students pay lower out-of-state tuition rates, schools enroll more motivated students from other areas, and states benefit from each other’s specialized college programs without having to create their own..."
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