| Company Name | Categories | City | State | Main Phone # |
|---|
| Ochoa Brothers Construction LLC | Site Construction, Concrete, Contractor | Bend | OR | 541-693-3474 |
| Old Town Concrete Construction Co. | Concrete | Redmond | OR | 541-527-9815 |
| Olsen Design & Development Inc. | General Requirements, Contractor | Monmouth | OR | 503-838-1600 |
| Olson Heating & Air | Specialties, Mechanical | Sisters | OR | 541-504-0734 |
| OR Concrete, Inc. | Concrete, Finishes | Bend | OR | 541-480-3674 |
| Oregon Equipment Service Corp | Equipment | Bend | OR | 541-388-2235 |
| Oregon Smart Home & Security | General Requirements | Bend | OR | 541-213-7177 |
| Oregon Truss | Wood and Plastics | Bend | OR | 541-382-6000 |
| Oregon Underground & Utilities | Site Construction | Redmond | OR | 541-771-0201 |
| Original Industries Incorporated | Specialties, Contractor | Prineville | OR | 541-588-7280 |