About MSHSAA Contact Information email@mshsaa.org Send mail to us at: MSHSAA PO BOX 1328 Columbia, MO 65205-1328 Street Address: Missouri State High School Activities Association 1 North Keene St. Columbia, MO 65201-6645 Call or Fax us at: (573) 875-4880 Office (573) 875-1450 Fax (573) 875-2379 Fax For Transfer Forms .