| 3 C's Ornamental Iron Works | Javier Valencia Chavez | — | (408) 225 4100 | Other | Waterford · Stanislaus County | — | — |
| 3 D Green Plumbing | 3 D Green Plumbing | — | (209) 808 6807 | Other | Modesto · Stanislaus County | — | — |
| 360 Waterproofing Services | Barrera Bustos Samuel | — | (408) 648 3779 | Other | Patterson · Stanislaus County | — | — |
| 3D Door Designs | 3D Door Designs | — | (209) 879 9153 | Other | Riverbank · Stanislaus County | — | — |
| 3G Flooring Solutions | 3G Flooring Solutions | — | (209) 252 2100 | Other | Crows Landing · Stanislaus County | — | — |
| 4 Ace Tile | 4 Ace Tile | — | (209) 522 2453 | Other | Modesto · Stanislaus County | — | — |
| 7/11 Materials INC | Deanna Antonette Renteria | — | (209) 521 9771 | Other | Modesto · Stanislaus County | — | — |
| 8 A Insulation Co | Ochoa Jaime | — | (209) 968 8024 | Other | Ceres · Stanislaus County | — | — |
| 8A Stone & Tile Surfaces | 8A Stone & Tile Surfaces | — | (209) 289 7657 | Other | Modesto · Stanislaus County | — | — |
| 91 Plumbing Company | James Lewis Jr Bolin | — | (209) 552 5209 | Other | Modesto · Stanislaus County | — | — |
| A & J Flooring | Jafet Conrado Cruz Garcia | info@ajflooring.com | (209) 985 1205 | Other | Modesto · Stanislaus County | — | — |
| A & R Concrete INC | Oscar Ruben Ahumada | — | (209) 604 0027 | Other | Modesto · Stanislaus County | — | — |
| A 2 Z Garage Doors | A 2 Z Garage Doors | — | (209) 652 2686 | Other | Modesto · Stanislaus County | — | — |
| A B P / All Bay Plumbing INC | Richard Hernandez Ochoa | — | (209) 551 4357 | Other | Modesto · Stanislaus County | — | — |
| A J V Tile Marble & Granite | Verduzco Emiliano | — | (209) 681 1704 | Other | Modesto · Stanislaus County | — | — |
| A Professional Garage Door Service INC | Luis Gerardo Escobedo | — | (209) 605 5751 | Other | Ceres · Stanislaus County | — | — |
| A S A P Plumbing | A S A P Plumbing | — | (209) 847 9480 | Other | Oakdale · Stanislaus County | — | — |
| A Step Above Flooring INC | Fred Allen Ruelas | — | (209) 571 8583 | Other | Modesto · Stanislaus County | — | — |
| A-1 Janitorial Services | Jesse Osvaldo Rivera | — | (209) 204 5312 | Other | Patterson · Stanislaus County | — | — |
| A-1 Plumbing | A-1 Plumbing | — | (209) 541 4540 | Other | Modesto · Stanislaus County | — | — |
| A-1 Systematic Fire Protection INC | Mario Jr Rubio | — | (510) 514 5684 | Other | Patterson · Stanislaus County | — | — |
| A-maze Plumbing Services | Aleksandr Viktorovich Loboda | — | (209) 495 9416 | Other | Modesto · Stanislaus County | — | — |
| A2z Drywall Construction | Hernandez Alfredo | — | (209) 380 9183 | Other | Ceres · Stanislaus County | — | — |
| Aaron Triller | Aaron Triller | — | (209) 303 6284 | Other | Modesto · Stanislaus County | — | — |
| Aaron's Well Drilling INC | Ron Johns | — | (209) 479 8229 | Other | Denair · Stanislaus County | — | — |
| Ab-rod Tile | Ab-rod Tile | — | (209) 652 9240 | Other | Modesto · Stanislaus County | — | — |
| Abbey Carpet And Interiors | Scott R Larson | — | (209) 847 7656 | Other | Oakdale · Stanislaus County | — | — |
| Abney Carpet Installation INC | Brandy Lee Abney | — | (209) 578 3092 | Other | Modesto · Stanislaus County | — | — |
| Absolute Fire Sprinklers LLC | Jason Christopher Kreisel | — | (925) 580 1926 | Other | Turlock · Stanislaus County | — | — |
| Absolute Tile Co | John Carl Jr Fernandes | — | (209) 569 0806 | Other | Modesto · Stanislaus County | — | — |
| Abundant Metal Works LLC | Acevedo Yael Abundiz | — | (209) 303 8256 | Other | Ceres · Stanislaus County | — | — |
| Accelerated Engineering Management INC | Daniel Michael Cotrone | — | (916) 407 2355 | Other | Modesto · Stanislaus County | — | — |
| Accent Tile | Accent Tile | — | (209) 505 0425 | Other | Oakdale · Stanislaus County | — | — |
| Accesspro Door Solutions | Rene Amilcar Cuellar | — | (209) 605 6947 | Other | Modesto · Stanislaus County | — | — |
| Accurate Sawcutting INC | Mary Elena Machado | — | (209) 632 5010 | Other | Turlock · Stanislaus County | — | — |
| Ace Of Concrete | Ace Of Concrete | — | (209) 564 6021 | Other | Modesto · Stanislaus County | — | — |
| Ace Tile And Tadelakt Co | Frank Iii Zavala | — | (209) 620 7112 | Other | Riverbank · Stanislaus County | — | — |
| Acre Drywall | Acre Drywall | — | (209) 404 2166 | Other | Modesto · Stanislaus County | — | — |
| Adams Family Flooring | Adams Family Flooring | — | (209) 499 0296 | Other | Modesto · Stanislaus County | — | — |
| Adams Underground Iii | Adams Underground Iii | — | (209) 485 0092 | Other | Waterford · Stanislaus County | — | — |