| 21st Century Floors | 21st Century Floors | — | (707) 467 0181 | Other | Ukiah · Mendocino County | — | — |
| A-1 Septic Tank Service | Richard Anthony Ricca | — | (707) 937 0496 | Other | Littleriver · Mendocino County | — | — |
| Aaa Organized Plumbing | Willow Eric Stone-Baumann | ap@aaaorganizedplumbing.com | (707) 621 8282 | Other | Ukiah · Mendocino County | — | — |
| Abbaca Construction | Jesse Clifton Hutchins | — | (707) 391 5645 | Other | Redwood Valley · Mendocino County | — | — |
| Akeff Construction Services INC | Jeffrey Scott Green | — | (707) 964 7346 | Other | Fort Bragg · Mendocino County | — | — |
| Anderson Logging INC | Myles Benjamin Anderson | — | (707) 964 2770 | Other | Fort Bragg · Mendocino County | — | — |
| Anderson Valley Water Systems | Charles William Paget-Seekins | — | (707) 367 3874 | Other | Philo · Mendocino County | — | — |
| Apex Metal Gutters | Apex Metal Gutters | apexmetalgutters@gmail.com | (530) 665 3818 | Other | Ukiah · Mendocino County | — | — |
| Arrow Fencing | Jay Christopher Woida | charlie@arrowfencing.com | (707) 485 1128 | Other | Calpella · Mendocino County | — | — |
| Atkinson Welding | Atkinson Welding | — | (707) 841 6287 | Other | Willits · Mendocino County | — | — |
| B & B Equipment | B & B Equipment | — | (707) 462 8347 | Other | Ukiah · Mendocino County | — | — |
| Bed Rock Concrete Pumping | Bed Rock Concrete Pumping | — | (707) 882 2637 | Other | Point Arena · Mendocino County | — | — |
| Ben Fairall | Ben Fairall | — | (707) 671 3379 | Other | Redwood Valley · Mendocino County | — | — |
| Ben Fienburgh Excavating | Fienburgh Benjamin | — | (707) 357 4992 | Other | Fort Bragg · Mendocino County | — | — |
| Black Shamrock Construction & Engineering Co | Travis Patrick O'ferrall | — | (707) 357 3333 | Other | Ukiah · Mendocino County | — | — |
| Blum's Affordable Plumbing INC | Robert Nowell Jr Blum | — | (707) 456 0996 | Other | Willits · Mendocino County | — | — |
| Brad Ingram Construction | Brad Allen Ingram | — | (707) 489 6741 | Other | Redwood Valley · Mendocino County | — | — |
| Britos Plumbing Services | Alexis Michell Brito Palomares | — | (707) 799 9730 | Other | Ukiah · Mendocino County | — | — |
| Bud Garman Construction Services INC | Beda Henry Garman | — | (707) 459 5859 | Other | Willits · Mendocino County | — | — |
| C W Sams Tile | C W Sams Tile | — | (707) 272 4581 | Other | Willits · Mendocino County | — | — |
| C. Forrester General Manuf. Housing | C. Forrester General Manuf. Housing | — | (530) 712 1946 | Other | Ukiah · Mendocino County | — | — |
| Cabinet Facelift Company The | Stephen Delmore Hill | — | (707) 486 2302 | Other | Laytonville · Mendocino County | — | — |
| Cabinet Werks INC | Keith Charles Graydon | — | (707) 485 1102 | Other | Ukiah · Mendocino County | — | — |
| Caico's Plumbing | Caico's Plumbing | — | (707) 391 0431 | Other | Ukiah · Mendocino County | — | — |
| Carl Rittiman And Associates INC | Carl Alfred Rittiman | — | (707) 937 0804 | Other | Mendocino · Mendocino County | — | — |
| Carmichael-long Tree Service | Dustin Lee Carmichael | — | (707) 813 7178 | Other | Fort Bragg · Mendocino County | — | — |
| Carters Drywall Corporation | Travis Justin Ray Carter | — | (707) 380 7026 | Other | Willits · Mendocino County | — | — |
| Casey's Earthworks | Casey's Earthworks | — | (707) 357 1166 | Other | Mendocino · Mendocino County | — | — |
| Cash Carpet Service INC | Daniel Earl Cash | — | (707) 621 2820 | Other | Willits · Mendocino County | — | — |
| Cesar Muniz Plumbing | Cesar Muniz Plumbing | — | (707) 272 5457 | Other | Ukiah · Mendocino County | — | — |
| Chance Hart Trucking & Excavation | Chance Hart Trucking & Excavation | — | (707) 354 1595 | Other | Covelo · Mendocino County | — | — |
| Coast Tile Company | Eric Miles Cissna | — | (707) 291 3227 | Other | Gualala · Mendocino County | — | — |
| Coastal Well Cleaning | Coastal Well Cleaning | — | (707) 964 5939 | Other | Fort Bragg · Mendocino County | — | — |
| Coleman Plumbing | Coleman Plumbing | — | (707) 485 2854 | Other | Redwood Valley · Mendocino County | — | — |
| Concrete Pete INC | Peter Raymond Jr| Gallegos Pete Raymond Gallegos | pete@concretepete.com | (707) 472 6918 | Other | Ukiah · Mendocino County | — | — |
| Cooper Plumbing | Cooper Plumbing | — | (707) 962 3017 | Other | Fort Bragg · Mendocino County | — | — |
| Cooper Plumbing INC | Micah John Cooper | — | (707) 962 3017 | Other | Fort Bragg · Mendocino County | — | — |
| Craig Titus | Craig Titus | — | (707) 895 3424 | Other | Boonville · Mendocino County | — | — |
| Cronin's Custom Metals | Cronin's Custom Metals | — | (707) 813 4593 | Other | Fort Bragg · Mendocino County | — | — |
| Crosetti Excavation INC | Lee Orin Howard | — | (707) 989 8974 | Other | Ukiah · Mendocino County | — | — |