| Company | City | State / Province | Country | Phone | Website |
|---|---|---|---|---|---|
| Northfield Block, an Oldcastle Company | West Bend | WI | US | (770) 522-5600 | northfieldblock.com |
| Oaks Concrete Products | Hillsdale | ON | CA | (905) 840-1011 | oakspavers.com |
| Oaks Concrete Products | Brockville | ON | CA | (905) 840-1011 | oakspavers.com |
| Oaks Concrete Products | Cambridge | ON | CA | (905) 840-1011 | oakspavers.com |
| Oaks Concrete Products | Markham | ON | CA | (905) 840-1011 | oakspavers.com |
| Oaks Concrete Products | Wixom | MI | US | (905) 840-1011 | oakspavers.com |
| Oberfields - A Quikrete Company | Obetz | OH | US | (404) 634-9100 | oberfields.com |
| Oberfields - A Quikrete Company | Delaware | OH | US | (404) 634-1900 | oberfields.com |
| Oldcastle | Minnetonka | MN | US | (770) 522-5600 | anchorblock.com |
| Oldcastle | Ogden | UT | US | (770) 522-5600 |
Concrete Masonry & Hardscapes Association