| Lab Number | Lab Name | City | State |
|---|---|---|---|
| 913509 | R. K. Hall Construction, LLC De Queen Laboratory | De Queen | AR |
| 908403 | R.K. Hall Construction, LLC Texarkana Laboratory | Texarkana | AR |
| 923323 | Robertson Contractors, Inc. Robertson Contractors Inc. Laboratory | Poplar Bluff | MO |
| 923824 | Robinson Construction, LLC Shady Point Laboratory | Shady Point | OK |
| 901300 | Rogers Group, Inc. Cabot Laboratory | Cabot | AR |
| 911706 | Rogers Group, Inc. Greenbrier Laboratory | Greenbrier | AR |