There is no autism school in Bismarck, and no private special-education day school either. What there is: a district special-education unit covering a wide range of services, and Anne Carlsen Center - a statewide nonprofit whose Bismarck site provides therapy and ABA rather than schooling. Being clear about that difference matters.
District special-education unit on North Washington Street covering assistive technology, early intervention, extended school year, OT and PT, school psychology, social work, transportation and vision services.
Bismarck site on North Kavaney Drive providing speech and occupational therapy, behavioral health, autism assistance including ABA, parent involvement, visual supports, and in-home and respite care. Services, not schooling.