<p>Hi all,</p>
<p>What's the purpose of supplying one's Social Security Number (optional) on the common app and college supplements other than proving US residency? I hear it could be used for financial aid, but if I'm not applying/ do not qualify for financial aid would supplying my SSN still be prudent?</p>
<p>It's not like I don't trust these schools, but if I don't have to supply my SSN, I'd rather not.</p>
<p>Thanks.</p>