| John C Van Gaale | John C Van Gaale | — | (951) 704 9289 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| John Charles Locke | John Charles Locke | — | (909) 815 9923 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| John Christian Plumbing | John Christian Plumbing | — | (951) 315 6988 | Other | Riverside · Riverside County | — | — |
| John Cordrey Landscaping | John Cordrey Landscaping | — | (951) 392 0633 | Windows, patio, painters | Hemet · Riverside County | — | — |
| John Cross Construction | John Robert Cross | — | (951) 318 4619 | Other | Riverside · Riverside County | — | — |
| John Delmatoff Backhoe Service INC | Stenya Troy Delmatoff | — | (951) 371 4839 | Other | Norco · Riverside County | — | — |
| John Egetter | John Egetter | — | (760) 275 3523 | Electricians | Banning · Riverside County | — | — |
| John Ellero | John Ellero | — | (951) 526 2073 | Other | Sun City · Riverside County | — | — |
| John Evans | John Evans | — | (951) 893 0893 | Other | Corona · Riverside County | — | — |
| John Griffin Construction INC | John Frederick Griffin | info@johngriffinconstruction.com | (951) 278 2377 | Electricians | Corona · Riverside County | — | — |
| John Haley Construction INC | John Joseph Haley | — | (949) 262 1962 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| John Harrison Contracting INC | Monica Carolina| Valdez Monica C Marroquin | — | (760) 322 2653 | HVAC | Banning · Riverside County | — | — |
| John Hrynkiewicz | John Hrynkiewicz | — | (530) 605 8626 | GC, remodel, ADU | Corona · Riverside County | — | — |
| John HVAC Services | Nyunkun Lee | — | (951) 746 6740 | HVAC | Murrieta · Riverside County | — | — |
| John J Peterson | John J Peterson | — | (760) 272 5951 | GC, remodel, ADU | Desert Hot Springs · Riverside County | — | — |
| John Keith Mattera | John Keith Mattera | — | (951) 249 2902 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| John Konopacky Property Repair & Maintenance | John Philip Konopacky | — | (619) 933 7711 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| John Koons Drywall INC | John Dale Koons | — | (951) 928 2411 | Other | Romoland · Riverside County | — | — |
| John Leon Castanien | John Leon Castanien | — | (760) 641 8345 | GC, remodel, ADU | Bermuda Dunes · Riverside County | — | — |
| John Loera | John Loera | — | (310) 930 8996 | GC, remodel, ADU | Cathedral City · Riverside County | — | — |
| John M Belanger | John M Belanger | — | (949) 279 0134 | Electricians | Corona · Riverside County | — | — |
| John Mahany Plumbing INC | Morris Rodriguez Guzman | — | (951) 567 3363 | Other | Riverside · Riverside County | — | — |
| John Maldonado | John Maldonado | — | (909) 772 4251 | Other | Aguanga · Riverside County | — | — |
| John Mark Justus Daniel John Justus Derek Gene Justus | John Mark Justus | — | (951) 699 1563 | Other | Temecula · Riverside County | — | — |
| John Maurice Bucklar Construction INC | John Maurice Bucklar | — | (760) 423 9135 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| John Mc Andrews Mountain Construction | John Edward Mc Andrews | — | (951) 837 6093 | GC, remodel, ADU | Banning · Riverside County | — | — |
| John Medina DBA Team Medina Construction | John Benito Medina | — | (951) 515 5609 | GC, remodel, ADU | Corona · Riverside County | — | — |
| John Meyer A/c | John Meyer A/c | — | (951) 205 0904 | HVAC | Riverside · Riverside County | — | — |
| John Minock Enterprises | John Howard Minock | — | (714) 430 4022 | Other | Lake Elsinore · Riverside County | — | — |
| John Myerly | John Myerly | — | (951) 284 9154 | GC, remodel, ADU | Corona · Riverside County | — | — |
| John Paliwoda | John Paliwoda | — | (951) 471 1500 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| John Patrick Jacobs | John Patrick Jacobs | — | (909) 208 1102 | GC, remodel, ADU | Wildomar · Riverside County | — | — |
| John Pepe Construction INC | Emidio Joseph Pepe | — | (951) 751 7209 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| John Pino Construction | John David Pino | — | (951) 704 0107 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| John R Montez Concrete INC | John Rupert Montez | — | (760) 636 0417 | Other | Thousand Palms · Riverside County | — | — |
| John S Dyas Jr | John S Dyas Jr | — | (714) 793 3105 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| John Stanley Paving | John Stanley Paving | — | (951) 333 5162 | Other | Perris · Riverside County | — | — |
| John Sujishi INC DBA J M S Electric | John Minoru Sujishi | — | (714) 334 9149 | Electricians | Canyon Lake · Riverside County | — | — |
| John Torres Landscaping | John Torres Landscaping | — | (951) 534 9493 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| John Wood Construction | John Alan Wood | — | (760) 917 9656 | GC, remodel, ADU | Temecula · Riverside County | — | — |