| Colusa Golf And Country Club | Colusa Golf And Country Club | — | (530) 501-8686 | Tree | Colusa · Colusa County | — | — |
| Colusa Indian Energy LLC | Bruce Thomas Geveden | — | (530) 682 6562 | Electricians | Colusa · Colusa County | — | — |
| Colusa Industrial Properties | Colusa Industrial Properties | — | (530) 458-2118 | GC, remodel, ADU | Colusa · Colusa County | — | — |
| Colusa Mechanical Systems INC | Juan Ramon Arambula Velazquez | — | (530) 407 3830 | Other | Williams · Colusa County | — | — |
| Colusa Plumbing Company | Jesse Saul Munoz | — | (530) 777 8877 | Other | Colusa · Colusa County | — | — |
| Cook Construction Engineering Partnership | Kenneth Maxwell Cook | — | (530) 713 3158 | Other | Stonyford · Colusa County | — | — |
| Cool-Roof Systems | Cool-Roof Systems | info@cool-roofsystems.com | (888) 476-8231 | Other roofers | San Marcos · Colusa County | — | — |
| Cotrone's Mechanical Services | Cotrone's Mechanical Services | — | (530) 458-8037 | GC, remodel, ADU | Colusa · Colusa County | — | — |
| Craig Hill | Craig Hill | — | (530) 701 2849 | GC, remodel, ADU | Colusa · Colusa County | — | — |
| Cromwell Electric | Aragon Cromwell | chriscromwell@cromwellelectric.com | (530) 718 8731 | Electricians | Williams · Colusa County | — | — |
| Cross Electric | Dennis Damien Cross | — | (530) 208 6187 | Electricians | Colusa · Colusa County | — | — |
| D And D Electric | John Lloyd Iii Daniels | — | (530) 619 9288 | Electricians | Colusa · Colusa County | — | — |
| Danmark Home Inspection | Danmark Home Inspection | — | (530) 619-2250 | Inspectors | Colusa · Colusa County | — | — |
| Davison Drugs & Stationery | Davison Drugs & Stationery | davison@colusanet.com | (530) 458-2188 | Alarm and generators | Colusa · Colusa County | — | — |
| Dos Rios INC | Ben Russell Phillips | — | (530) 458 8973 | Other | Colusa · Colusa County | — | — |
| Dsb Ag Services LLC DBA Dsb Excavating And Grading | Evan Scott Bell | — | (530) 682 4323 | Other | Williams · Colusa County | — | — |
| Ehrke Construction | Valerie Elaine Ehrke | — | (530) 681 1218 | GC, remodel, ADU | Arbuckle · Colusa County | — | — |
| Elite Window Tinting | Elite Window Tinting | — | (530) 458-1218 | Windows, patio, painters | Colusa · Colusa County | — | — |
| Emergency Water Solutions | Emergency Water Solutions | — | (530) 331-4368 | Restoration | Colusa · Colusa County | — | — |
| Ens Construction Custom Handyman Service | Ens Construction Custom Handyman Service | — | (916) 792-6745 | GC, remodel, ADU | Colusa · Colusa County | — | — |
| Fire And Ice Heating & Air | David Allen Paletta | — | (530) 458 4411 | HVAC | Colusa · Colusa County | — | — |
| Front Row Builders INC | Ronald Joe Moore | — | (415) 206 9100 | GC, remodel, ADU | Colusa · Colusa County | — | — |
| Fulcher Paint & Supply | Fulcher Paint & Supply | — | (530) 458-8684 | Windows, patio, painters | Colusa · Colusa County | — | — |
| Fulcher Painting | Kevin Lester Fulcher | — | (530) 870 1568 | Windows, patio, painters | Colusa · Colusa County | — | — |
| Fusaro Family Construction | Charles Martin Fusaro | — | (530) 635 3625 | GC, remodel, ADU | Colusa · Colusa County | — | — |
| G & G Of Lambertville | Rick Ted Greeson | — | (530) 521 2912 | Other | Princeton · Colusa County | — | — |
| G M Painting | G M Painting | impallari@gmail.com | (530) 713 8534 | Windows, patio, painters | Colusa · Colusa County | — | — |
| Genesis Landscaping Co | Alvarez Gonzalo | — | (530) 458 3110 | Windows, patio, painters | Colusa · Colusa County | — | — |
| Geo L Messick Co INC | Thomas P Reische | — | (530) 458 5144 | Other | Colusa · Colusa County | — | — |
| Glenn Cherry Drilling | Glenn Cherry Drilling | — | (530) 574 5729 | Other | Stonyford · Colusa County | — | — |
| Hardwick Construction LLC | Sherman Bruce Jr Hardwick | — | (530) 701 4051 | GC, remodel, ADU | Colusa · Colusa County | — | — |
| Hector Cardenas Construction | Cardenas Hector | — | (530) 570 0755 | GC, remodel, ADU | Williams · Colusa County | — | — |
| Hillside Electric | Antone Warren Silva | hillsideelectric111@gmail.com | (925) 699 6745 | Electricians | Colusa · Colusa County | — | — |
| Hoblit Motors Ford | Hoblit Motors Ford | — | (530) 458-2151 | Windows, patio, painters | Colusa · Colusa County | — | — |
| Iannone Drywall | Mathew Vance Iannone | — | (530) 908 5392 | Other | Arbuckle · Colusa County | — | — |
| Iverson Property Mgt. | Iverson Property Mgt. | — | (530) 682-5997 | Property managers | Colusa · Colusa County | — | — |
| Izaguirre Innovation INC DBA Sac River Electric | Emmanuel Flores Izaguirre | — | (530) 301 9873 | Electricians | Colusa · Colusa County | — | — |
| Jade Security Systems | Jade Security Systems | — | (760) 337-2100 | Alarm and generators | Brawley · Colusa County | — | — |
| John J Martin Backhoe Service | John Joseph Martin | — | (530) 682 1630 | Other | Arbuckle · Colusa County | — | — |
| Jv Concrete LLC | Vaca Jorge | — | (530) 870 1653 | Other | Colusa · Colusa County | — | — |