| OVOak Valley Hardwoods/woodlawn | Marion | NC | — | ◇ UNVERIFIED |
| OIOakwood Interiors | Ontario | CA | — | ◇ UNVERIFIED |
| OLOchoco Lumber Company | Prineville | OR | — | ◇ UNVERIFIED |
| OLOctave Labs LLC | Pleasant Hill | OR | — | ◇ UNVERIFIED |
| OLOctave Labs LLC | Springfield | OR | — | ◇ UNVERIFIED |
| OCOctober CO INC | Easthampton | MA | — | ◇ UNVERIFIED |
| OTOff the Wall CO LLC | Telford | PA | — | ◇ UNVERIFIED |
 Ofs Brands Holdings INC - Plant 11 | Leitchfield | KY | — | ◇ UNVERIFIED |
| OBOfs Brands INC Plant 23 | Archdale | NC | — | ◇ UNVERIFIED |
| OAOgb Architectural Millwork, INC. | Albuquerque | NM | — | ◇ UNVERIFIED |
| OMOhio Mulch Supply INC. (0125042476) | Columbus | OH | — | ◇ UNVERIFIED |
| OVOkaw Valley Woodworking | Arcola | IL | — | ◇ UNVERIFIED |
| OPOklahoma Pole and Lumber INC / Oklahoma Pole and Lumber INC | Broken Bow | OK | — | ◇ UNVERIFIED |
| OOldcastle | Elmer | NJ | — | ◇ UNVERIFIED |
| OLOldcastle Lawn and Garden | Tulia | TX | — | ◇ UNVERIFIED |
| OLOldcastle Lawn and Garden | Cedartown | GA | — | ◇ UNVERIFIED |
| OLOldcastle Lawn and Garden | Bruceton Mills | WV | — | ◇ UNVERIFIED |
| OLOldcastle Lawn and Garden Elmer | Elmer | NJ | — | ◇ UNVERIFIED |
| OLOldcastle Lawn and Garden, INC. | Davenport | FL | — | ◇ UNVERIFIED |
| OLOldcastle Lawn and Garden, INC. | Suffield, Township of | OH | — | ◇ UNVERIFIED |
| OCOld Castle Lawn and Garden INC - Pageland Plant | Pageland | SC | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Tylertown | MS | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Oskaloosa | IA | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Hartville | OH | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Cleveland | TX | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Livingston | TX | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Powderly | TX | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Shady Dale | GA | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Amherst Junction | WI | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Waterloo | IN | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Walterboro | SC | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Mclean | IL | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Hope | AR | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Elk River | MN | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Noblesville | IN | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Elgin | TX | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden | Springfield | OH | — | ◇ UNVERIFIED |
| OCOld Castle Lawn & Garden INC | Cross City | FL | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden INC | Wauchula | FL | — | ◇ UNVERIFIED |
| OLOldcastle Lawn & Garden INC | Marseilles | IL | — | ◇ UNVERIFIED |
| ODOld Durham Wood | Durham | CA | — | ◇ UNVERIFIED |
| OLOld Lane Plant | Rocky Mount | VA | — | ◇ UNVERIFIED |
| OMOld Mill Building Site | Bend | OR | — | ◇ UNVERIFIED |
| OSOld School Market INC | Sullivan | IL | — | ◇ UNVERIFIED |
| OSOld South Wood Preserving, INC. | Summertown | TN | — | ◇ UNVERIFIED |
| OVOld Virginia Furniture Company Dba Water | Lynchburg | VA | — | ◇ UNVERIFIED |
| OGOlen G. Parkhill Owner of Kendallwood Estates | Mahomet | IL | — | ◇ UNVERIFIED |
| OSOlivette Supply Co, INC | Greers Ferry | AR | — | ◇ UNVERIFIED |
| OWOlivier-celcure Wood Preserving CORP | New Orleans | LA | — | ◇ UNVERIFIED |
| OCOmega Cabinetry | Clinton | TN | — | ◇ UNVERIFIED |
