When addressing write the address parallel to the longest edge of the envelope.

The address you are mailing to should be written as follows:

Student's full name
Student's Post Office box number (not room number-omit if unknown)
Luther College
700 College Dr
Decorah, IA  52101-1045

If mailing to your student from outside the United States of America...

Student's full name
Student's Post Office box number (not room number-omit if unknown)
Luther College
700 College Dr
Decorah, IA  52101-1045
USA