Prairie Farms/Land O Lakes Share: Wholesale & Manufacturers Prairie Farms/Land O Lakes Visit Website Request Info PO Box 430 Bismarck, ND 58502-0430 (701) 223-3180 223-8642 (fax) About Rep Info Map About Dean Foods fluid dairy division Whom to Contact Roy Bailey Joan Christensen What's Nearby? Distance: 5 10 15 20 25 50 mi.