| O U R Children's Center | Harrison | 870 741-2625 |
| O'reilly Auto Parts | Harrison | 870 741-5441 |
| Oak Grove Church Of Christ | Oak Grove | 870 749-2814 |
| Oak Grove Gas & Grub | Oak Grove | 870 749-2984 |
| Oak Hills Apartments | Green Forest | 870 438-6558 |
| Oak Lane Free Will Baptist Study | Harrison | 870 741-3943 |
| Oak Park Mobile Home Living | Harrison | 870 743-3300 |
| Office Technology Unlimited | Harrison | 870 741-0325 |
| Old Main Street Trader | Harrison | 870 743-9838 |
| Omaha 1st Baptist Church | Omaha | 870 426-5800 |
| Omaha School Bus Garage | Omaha | 870 426-4135 |
| Omaha School Child Development | Omaha | 870 426-1108 |
| Omart | Harrison | 870 365-7251 |
| Omnicare Credit Union Inc | Harrison | 870 743-1467 |
| Open Door Baptist Church | Harrison | 870 741-8755 |
| Open Door Baptist Church Parsonage | Harrison | 870 741-3174 |
| Oregan Flat Baptist Church Parsonage | Bergman | 870 741-1428 |
| Osage Baptist Church | Alpena | 870 553-2437 |
| Osage Concrete Construction | Harrison | 870 553-2455 |
| Osage Natural Health Center | Green Forest | 870 438-5840 |
| Our Cooperative | Harrison | 870 743-9100 |
| Out To Lunch | Harrison | 870 741-3301 |
| Outdoor Resorts Of The Ozarks | Oak Grove | 870 749-2700 |
| Oxygen Services Of America | Harrison | 870 743-5000 |
| Ozark Abstract | Harrison | 870 391-2244 |
| Ozark Auto Body & Sales Inc | Harrison | 870 741-4722 |
| Ozark Baptist Church | Bergman | 870 741-4957 |
| Ozark Bearing & Supply | Harrison | 870 741-3777 |
| Ozark Connections- Inc. | Harrison | 870 741-2400 |
| Ozark Counseling Services | Harrison | 870 741-1564 |
| Ozark Counseling Services | Harrison | 870 741-8219 |
| Ozark Emporium | Harrison | 870 741-1301 |
| Ozark Humane Society Shelter | Harrison | 870 741-3050 |
| Ozark Humane Society Thrift Store | Harrison | 870 741-8752 |
| Ozark Marine Auto & Truck | Diamond City | 870 422-1371 |
| Ozark Mountain Inn | Harrison | 870 743-1949 |
| Ozark Mountain Smokehouse | Harrison | 870 741-9883 |
| Ozark Opportunities Inc - Boone County | Harrison | 870 741-2089 |
| Ozark Opportunities Inc - Boone County- Head Start | Harrison | 870 447-2345 |
| Ozark Outpost | Harrison | 870 743-9466 |
| Ozark Pet Care Center | Harrison | 870 741-4452 |
| Ozark Rape Crisis Center | Harrison | 870 741-4141 |
| Ozark Rape Crisis Center - Office | Harrison | 870 741-1328 |
| Ozark Recording Studio | Harrison | 870 741-1476 |
| Ozark Refrigeration & Appliance | Harrison | 870 741-7900 |
| Ozark Truck & Auto Center | Harrison | 870 741-1814 |
| Ozark View Rv Park - Branson Area | Omaha | 870 426-5166 |
| Ozarks Computer Consulting | Green Forest | 870 438-6203 |
| Ozarks Outdoor Environments | Omaha | 870 426-2433 |
