| Ongrade Concrete Co | Eduardo Samuel Garcia-fuentes | — | (831) 431 3625 | Other | Salinas · Monterey County | — | — |
| Onitsuka Framing | Onitsuka Framing | — | (831) 214 8378 | Other | Salinas · Monterey County | — | — |
| Only Clear Window Cleaning | Only Clear Window Cleaning | — | (831) 901 0307 | Other | Seaside · Monterey County | — | — |
| Onpoint Generators INC | Anupam Sharma | — | (831) 375 1463 | Electricians | Seaside · Monterey County | — | — |
| Optimal Ornamental Steel Fabrication | Juan Alberto Martinez | — | (831) 718 7380 | Other | Salinas · Monterey County | — | — |
| Option A Cabinets | Option A Cabinets | — | (831) 707 7410 | Other | Marina · Monterey County | — | — |
| Originality Painting | Originality Painting | — | (831) 676 1453 | Windows, patio, painters | Soledad · Monterey County | — | — |
| Orlebeck Construction INC | Bruce Robert Orlebeck | — | (831) 901 8787 | GC, remodel, ADU | Castroville · Monterey County | — | — |
| Ormond Construction | Russell Jay Ormond | tommy@ormondconstruction.com | (502) 419-6072 | GC, remodel, ADU | Pebble Beach · Monterey County | — | — |
| Ornamental Iron Solutions | Ornamental Iron Solutions | — | (619) 547-3687 | Other | Chualar · Monterey County | — | — |
| Orozco Painting | Orozco Painting | — | (831) 320 7113 | Windows, patio, painters | Salinas · Monterey County | — | — |
| Oscar Vargas | Oscar Vargas | — | (831) 869 0195 | GC, remodel, ADU | Salinas · Monterey County | — | — |
| Oscar's Electric Services INC | Oscar Cardenas Torres | — | (831) 521 6092 | Electricians | Seaside · Monterey County | — | — |
| Osorios Custom Painting | Gabriela Osorio | — | (831) 272 8030 | Windows, patio, painters | Salinas · Monterey County | — | — |
| Osvern B Stout | Osvern B Stout | — | (831) 663 3155 | GC, remodel, ADU | Aromas · Monterey County | — | — |
| Otter Painting | Otter Painting | — | (831) 224 2774 | Windows, patio, painters | Pacific Grove · Monterey County | — | — |
| Out Of The Woods INC | George Frederick Young | — | (831) 717 4259 | Other | Sand City · Monterey County | — | — |
| Oviedo's Construction INC | Jose Manuel Oviedo Ruiz | — | (831) 770 9311 | GC, remodel, ADU | Salinas · Monterey County | — | — |
| Oz Construction | Ortiz Javier | info@ozconstruction.com | (831) 905 8042 | GC, remodel, ADU | Salinas · Monterey County | — | — |
| Ozcon Construction Company | Eliberto Zamora Ortiz | — | (831) 229 7529 | GC, remodel, ADU | Salinas · Monterey County | — | — |
| Ozzie Construction | Ramirez Oswaldo Trigueros | — | (831) 869 2230 | GC, remodel, ADU | Seaside · Monterey County | — | — |
| Ozzy Tile | Ozzy Tile | — | (831) 578 4562 | Other | Salinas · Monterey County | — | — |
| P B Cordrey Construction | Phillip Byington Cordrey | — | (831) 214 2544 | GC, remodel, ADU | Carmel Valley · Monterey County | — | — |
| P G Computers | P G Computers | — | (831) 402 9411 | Other | Monterey · Monterey County | — | — |
| P M Landscaping Services LLC | Manca Paolo | abuquintero35@gmail.com | (831) 324 0637 | Windows, patio, painters | Monterey · Monterey County | — | — |
| P S Landscaping | P S Landscaping | — | (831) 915 8637 | Windows, patio, painters | Seaside · Monterey County | — | — |
| Pacheco Nextgen Construction | Eliseo G Pacheco | — | (831) 596 7305 | GC, remodel, ADU | Salinas · Monterey County | — | — |
| Pacific Coast Builders | Pacific Coast Builders | — | (831) 915 8059 | GC, remodel, ADU | Carmel · Monterey County | — | — |
| Pacific Coast Construction & Land Co | George Hans Ii Steen-Larsen | — | (831) 887 8967 | GC, remodel, ADU | Monterey · Monterey County | — | — |
| Pacific Coast Electric | Schneider Kenneth | — | (831) 521 3241 | Electricians | Marina · Monterey County | — | — |
| Pacific Coast Electrical Systems LLC | Kenneth Schneider | — | (831) 521 3241 | Electricians | Marina · Monterey County | — | — |
| Pacific Coast Flooring | Pacific Coast Flooring | — | (831) 970 1872 | Other | Salinas · Monterey County | — | — |
| Pacific Coast Innovations | Pacific Coast Innovations | — | (831) 261 7370 | GC, remodel, ADU | Carmel Valley · Monterey County | — | — |
| Pacific Coast Plumbing | Pacific Coast Plumbing | — | (831) 633 1510 | Other | Castroville · Monterey County | — | — |
| Pacific Coast Tile And Marble | Pacific Coast Tile And Marble | migvillamil82@gmail.com | (831) 444 5008 | Other | Greenfield · Monterey County | — | — |
| Pacific Coast Trees | Vargas Erika | — | (831) 809 0954 | Tree | Salinas · Monterey County | — | — |
| Pacific Grove Property Management | Pacific Grove Property Management | info@pacificgroverentals.com | (831) 658-4005 | Property managers | Pacific Grove · Monterey County | — | — |
| Pacific Landscaping & Tree Service INC | Tony Jimenez | — | (831) 521 5960 | Windows, patio, painters | Marina · Monterey County | — | — |
| Pacific Lawn And Design INC | Jorge Luis Abrajan Torralba | — | (831) 920 9208 | Windows, patio, painters | Seaside · Monterey County | — | — |
| Pacific Oak Development INC | Erik Nielsen Pilegaard | — | (916) 425 5858 | GC, remodel, ADU | Carmel · Monterey County | — | — |