University of Colorado Boulder mailing address
To mail CU Boulder, a public research university in Boulder, send your letter to University of Colorado Boulder, Office of Admissions, Regent Administrative Center 125, 552 UCB, Boulder, CO 80309-0552. The University of Colorado Boulder is a public research university in Boulder, Colorado, and the flagship of the University of Colorado system. Use it for correspondence, admissions or application documents, and official transcripts. Add your return address if you'd like a reply, and confirm the office address on CU Boulder's official contact page before anything deadline-driven.
Office of Admissions
University of Colorado Boulder Office of Admissions Regent Administrative Center 125 552 UCB Boulder CO 80309-0552
Undergraduate admission documents by USPS. Overnight/courier: 3100 Marine Street, Bldg RL3 Suite A-122, Boulder, CO 80303-1058.
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University of Colorado BoulderOffice of Admissions552 UCBBoulder, CO 80309-0552
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Key facts
- Undergraduate admission documents by USPS. Overnight/courier: 3100 Marine Street, Bldg RL3 Suite A-122, Boulder, CO 80303-1058.
- Add an attention line (e.g. "Office of Admissions" or the registrar) so your mail reaches the right office.
- The University of Colorado Boulder is a public research university in Boulder, Colorado, and the flagship of the University of Colorado system.
- Admissions and registrar offices sometimes use a PO box that differs from the campus street address — confirm before a deadline.
- A student living in residence has their own campus mailbox address, which is different from the office address above.
- PostPal prints your letter and mails it for you — no printer, envelope, stamps, or post office trip.
How to send your letter
- 1
Confirm which office you need
Address your letter to the specific office or person you need — for example "Office of Admissions", the registrar, a department, or a student's name and residence. An attention line keeps it from sitting in a general mailroom.
- 2
Prepare your letter or documents
Include any student or applicant ID, application or reference number, and your return address so the office can respond. For official transcripts or forms, follow the school's stated format and enclose anything they ask for.
- 3
Address it correctly
First line: University of Colorado Boulder. Next: Office of Admissions. Then the street: 552 UCB. Then the city line: Boulder CO 80309-0552. Double-check the office address above against the school's contact page for anything deadline-driven.
- 4
Send it with PostPal
Write or upload your letter to PostPal with the address above prefilled. We print it, add your return address, and mail it for you — no printer, envelope, stamps, or trip to the post office.
Common questions
What is CU Boulder's mailing address?
University of Colorado Boulder, Office of Admissions, Regent Administrative Center 125, 552 UCB, Boulder, CO 80309-0552. Undergraduate admission documents by USPS. Overnight/courier: 3100 Marine Street, Bldg RL3 Suite A-122, Boulder, CO 80303-1058. Confirm the office address on CU Boulder's official contact page before anything deadline-driven — admissions and registrar offices sometimes use a different PO box.
Where do I mail admissions or application documents to CU Boulder?
Send them to the admissions office. Use the admissions address listed above. Include your applicant ID or Common App / application number, and mail well ahead of the deadline — the postmark or receipt date is what counts.
How do I send an official transcript to CU Boulder?
Official transcripts usually go to the admissions or registrar office in a sealed envelope from your prior school. Address it to CU Boulder at the office above (or the registrar, if given), and check whether CU Boulder also accepts secure electronic transcripts — many do.
Can I mail a letter to a student living at CU Boulder?
Yes, but a student in residence has their own campus mailbox address (residence hall + room or mailbox number), which is not the same as the office address above. Ask the student for their exact residence mailing address; the school's housing or mail-services page also explains its format.
Will someone read my letter or write back?
University offices route incoming mail to the right team, so a correctly addressed letter does get handled — but a personal reply isn't guaranteed. Including your return address, an ID or reference number, and a clear request gives you the best chance of a response.
How do I mail CU Boulder a letter without a printer?
Write or upload your letter to PostPal with the address prefilled. We print it, add your return address, and mail it for you — no printer, stamps, or post office trip needed.
Sources
Addresses verified August 2026 against official sources. Always confirm on the official site before time-sensitive filings.