| J M Contractor Services | John Anthony Mueller | — | (209) 489 7185 | GC, remodel, ADU | Los Banos · Merced County | — | — |
| J M Willson Construction | James Michael Willson | — | (209) 261 2449 | GC, remodel, ADU | Atwater · Merced County | — | — |
| J Moraga Construction INC | Jose Carlos Moraga | — | (209) 388 9200 | Other | Merced · Merced County | — | — |
| J T Landscape Management | J T Landscape Management | — | (209) 398 9279 | Windows, patio, painters | Delhi · Merced County | — | — |
| J T Utility Services Group | Javier Torres-Almaraz | — | (253) 459 0957 | Other | Winton · Merced County | — | — |
| J Top Notch Floorcovering | J Top Notch Floorcovering | — | (408) 665 1519 | Other | Los Banos · Merced County | — | — |
| J V Imagine Painting Solutions | J V Imagine Painting Solutions | — | (209) 489 4058 | Windows, patio, painters | Livingston · Merced County | — | — |
| J W Dimarzio Construction | Joseph William Di Marzio | — | (209) 761 9781 | GC, remodel, ADU | Los Banos · Merced County | — | — |
| J&b Fencing INC | Javier Aranda Zuniga | — | (209) 723 6243 | Other | Merced · Merced County | — | — |
| J&r Energy Construction INC | Medina Ivan Espinoza | — | (408) 705 3761 | GC, remodel, ADU | Los Banos · Merced County | — | — |
| J's Plumbing Construction | Juan Ochoa Lomeli | — | (209) 564 0430 | Other | Merced · Merced County | — | — |
| Jack Begley Painting And Decorating Service | Jack Ray Jr Begley | — | (209) 769 3568 | Windows, patio, painters | Los Banos · Merced County | — | — |
| Jacqueline's Painting & Decorating | Jacqueline's Painting & Decorating | — | (510) 910 2953 | Windows, patio, painters | Gustine · Merced County | — | — |
| Jantz Family Electric A Partnership | Mark Wendell Jantz | — | (209) 445 1963 | Electricians | Winton · Merced County | — | — |
| Jantz Group | James Ray Jantz | james@jantzgroup.com | (209) 850 0044 | GC, remodel, ADU | Atwater · Merced County | — | — |
| Jasa Concrete INC | Juan Luis Amaya Atayde | — | (408) 590 2245 | Other | Los Banos · Merced County | — | — |
| Jay Ra Hardwood Floors INC | Jayden Gonzalez | jayden@jayrahardwoodfloors.com | (669) 699 8990 | Other | Los Banos · Merced County | — | — |
| Jay's Demolition INC | Julio Higareda Hernandez | jaysdemolition2023@gmail.com | (209) 500 7798 | Other | Merced · Merced County | — | — |
| Jc Grading Paving Solution INC | Jose Antonio Centeno Aceves | projects@jcgradingpavingsolution.com | (408) 656-8639 | Other | Los Banos · Merced County | — | — |
| Jcp Concrete INC | Ildefonso A Ramirez Andrade | — | (209) 209 8869 | Other | Winton · Merced County | — | — |
| Jd Pumps | Jd Pumps | info@jd-pumps.com | (209) 676 0437 | Other | Livingston · Merced County | — | — |
| Jda Insulation | Carlos Jorge Barrueta Tarazona | — | (209) 777 7561 | Other | Atwater · Merced County | — | — |
| Jdl Glass Incorporated | Juan Diego Lopez | — | (559) 352 9655 | Windows, patio, painters | Atwater · Merced County | — | — |
| Je Hernandez Builders | Jesus Enrique Hernandez | — | (209) 394 4528 | GC, remodel, ADU | Livingston · Merced County | — | — |
| Jeff's Home Improvement Service | Jeffrey Alan Frederick | — | (209) 769 5124 | GC, remodel, ADU | Merced · Merced County | — | — |
| Jeremy S Boland | Jeremy S Boland | — | (209) 610 0635 | GC, remodel, ADU | Snelling · Merced County | — | — |
| Jesus Freaks | Jesus Freaks | — | (209) 777 4096 | Windows, patio, painters | Merced · Merced County | — | — |
| Jesus Lopez Parache | Jesus Lopez Parache | — | (209) 489 1675 | Electricians | Los Banos · Merced County | — | — |
| Jfi Home Builders | Jesus Fernando Nicolau Imperio | — | (408) 621 3632 | GC, remodel, ADU | Los Banos · Merced County | — | — |
| Jg Aerial Communications | Johnny Steven Garcia | — | (661) 564 2849 | Other | Atwater · Merced County | — | — |
| Jg Concrete Pro INC | Eduardo Rafael Torres Zepeda | — | (714) 559 8175 | Other | Livingston · Merced County | — | — |
| Jim Brisco Enterprises INC | Christopher George Morrow | — | (209) 356 3275 | Other | Atwater · Merced County | — | — |
| Jim The Plumber | Jim The Plumber | — | (209) 357 0296 | Other | Atwater · Merced County | — | — |
| Jim's Plumbing | Manuel Sanchez Zaragoza | — | (209) 358 4840 | Other | Atwater · Merced County | — | — |
| Jl And Son's Construction INC | Edgardo Cabrera Baron | — | (408) 839 0511 | GC, remodel, ADU | Los Banos · Merced County | — | — |
| Jlg Drywall | Jlg Drywall | — | (209) 769 5800 | Other | Winton · Merced County | — | — |
| Jm Construction Engineering INC | Rodrigo Jr Maldonado | — | (209) 668 4244 | GC, remodel, ADU | Ballico · Merced County | — | — |
| Jm Stucco Lath & Plastering INC | Munoz Alondra Alvarez | — | (408) 677 1377 | Other | Los Banos · Merced County | — | — |
| Jmo Construction And Electric | Mejia Ortega Javier | — | (209) 587 3931 | Electricians | Los Banos · Merced County | — | — |
| Jmp Flooring Solutions INC | Jose Martin Pimentil | — | (209) 531 4740 | Other | Hilmar · Merced County | — | — |