| A & B Grading Solutions | Josh Dean Hays | — | (530) 640 0468 | Other | Alturas · Modoc County | — | — |
| A & M Pump & Plumbing | William Kenneth Roberts | — | (530) 233 2773 | Other | Alturas · Modoc County | — | — |
| C8 Custom Metal LLC | Casey Ray Cockrell | — | (530) 708 7079 | Other | Alturas · Modoc County | — | — |
| Cascade Fencing | Cascade Fencing | — | (530) 640 2768 | Other | Alturas · Modoc County | — | — |
| Cole Willis Joiner | Cole Willis Joiner | — | (530) 640 2364 | Other | Lookout · Modoc County | — | — |
| Conners Well Drilling | Conners Well Drilling | — | (530) 299 3336 | Other | Adin · Modoc County | — | — |
| Conners Well Drilling | John Allen Conner | — | (530) 640 0521 | Other | Alturas · Modoc County | — | — |
| Copp's Irrigation INC | Thomas Todd Traphagan | — | (530) 299 3477 | Other | Adin · Modoc County | — | — |
| David H Hunt Construction | David Harry Hunt | — | (530) 605 7438 | Other | Adin · Modoc County | — | — |
| Downing Cabinet Installation INC | Robert Kevin Downing | — | (530) 225 6583 | Other | Alturas · Modoc County | — | — |
| Frank's Carpet And Furniture Company INC | James Lee Rollins | — | (530) 233 4422 | Other | Alturas · Modoc County | — | — |
| Heard Plumbing INC | Janice Louise Bartram | — | (530) 233 5181 | Other | Alturas · Modoc County | — | — |
| Intermountain Floors & Interiors | Intermountain Floors & Interiors | — | (530) 949 1940 | Other | Canby · Modoc County | — | — |
| Joiner Construction INC | Craig Willis Joiner | — | (530) 294 5318 | Other | Lookout · Modoc County | — | — |
| Lance Linker 49 Construction | Lance Burge Linker | — | (530) 233 0559 | Other | Cedarville · Modoc County | — | — |
| Lee Conner Well Drilling A Partnership | Lee Harvey Conner | — | (530) 640 0119 | Other | Cedarville · Modoc County | — | — |
| Rene Larranaga | Rene Larranaga | — | (530) 233 5050 | Other | Alturas · Modoc County | — | — |
| The Oak Mill | The Oak Mill | — | (530) 233 6748 | Other | Alturas · Modoc County | — | — |
| White Bear Construction INC | Laine Melvin Hoy | ahoywhitebear@outlook.com | (530) 233 4875 | Other | Alturas · Modoc County | — | — |