| Nori Edis Construction | Christopher Robin Kieselhorst | — | (707) 845 4957 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| Norse Flow Plumbing And Drain | Norse Flow Plumbing And Drain | — | (707) 267 0056 | Other | Ferndale · Humboldt County | — | — |
| North Coast Arborists LLC | Christopher Lance Plympton | northcoastarborists@gmail.com | (707) 460 5455 | Other | Samoa · Humboldt County | — | — |
| North Coast Cabinets | North Coast Cabinets | office@northcoastcabinets.com | (707) 725 0790 | Other | Fortuna · Humboldt County | — | — |
| North Coast Construction | William Walter Malinowski | — | (707) 298 1503 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| North Coast Drywall | North Coast Drywall | — | (408) 209 3656 | Other | Mc Kinleyville · Humboldt County | — | — |
| North Coast Fabricators | Erica Brittany Heenan | — | (707) 822 4629 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| North Coast Floor & Tile | Johannes Thomas Jordan | — | (707) 445 1805 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| North Coast Glass & Window | North Coast Glass & Window | info@northcoastglass.com | — | Windows, patio, painters | Eureka · Humboldt County | — | — |
| North Coast Painting | North Coast Painting | — | (707) 407-5665 | Windows, patio, painters | Mckinleyville · Humboldt County | — | — |
| North Coast Property Management | North Coast Property Management | moreinfo@northcoastpm.com | — | Property managers | Eureka · Humboldt County | — | — |
| North Coast Security | North Coast Security | — | (419) 334-3662 | Alarm and generators | Eureka · Humboldt County | — | — |
| North Coast Window Coverings | Sean Edward Finley | — | (707) 223 1095 | GC, remodel, ADU | Shelter Cove · Humboldt County | — | — |
| North Star Development INC | Kyle Gregory Boughton | — | (707) 496 0431 | GC, remodel, ADU | Arcata · Humboldt County | — | — |
| North West Electric Service | Michael Thomas Donahue | — | (530) 739 0231 | Electricians | Eureka · Humboldt County | — | — |
| Northbank Services LLC DBA Ace Handyman Services North Coast | Nicholas Joseph Reese | — | (707) 839 1545 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| Northcoast Acoustics | Northcoast Acoustics | — | (707) 444 9501 | Other | Eureka · Humboldt County | — | — |
| Northcoast Audio | Northcoast Audio | — | (707) 444 8700 | Other | Eureka · Humboldt County | — | — |
| Northcoast Awning Company INC | Jeffrey Aron Roney | — | (707) 616 4717 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| Northcoast Chimney Sweep INC | Loren Robert Ii Gerard | — | (707) 839 3993 | Other | Mc Kinleyville · Humboldt County | — | — |
| Northcoast Environmental Construction INC | James Anthony Roby | — | (707) 442 2032 | Other | Eureka · Humboldt County | — | — |
| Northcoast Lighting & Electric | Northcoast Lighting & Electric | — | (707) 269-0724 | Electricians | Eureka · Humboldt County | — | — |
| Northcoast Lighting And Electric INC | William Edward White | — | (707) 599 2211 | Electricians | Eureka · Humboldt County | — | — |
| Northcoast Plumbing LLC | Bartholomew Josef Lunn | — | (707) 267 7470 | Other | Eureka · Humboldt County | — | — |
| Northcoast Pumphouse | Northcoast Pumphouse | — | (707) 786 4281 | Other | Ferndale · Humboldt County | — | — |
| Northern Building Company | Jacob Charles Larson | — | (707) 616 1544 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Northern Humboldt Builder | Northern Humboldt Builder | — | (707) 498 9008 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| Northwest Plumbing Solutions LLC | Alexandra Anastassia Biegel | office@northwestplumbingsolutions.com | (369) 226 9660 | Other | Mc Kinleyville · Humboldt County | — | — |
| Norton Construction | Andrew Lindsay Norton | — | (707) 267 0277 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Norton Enterprises | Loren Boyd Norton | interested@domainmarket.com | (707) 499 8612 | GC, remodel, ADU | Hoopa · Humboldt County | — | — |
| Nst Development | Nst Development | nst_development@bk.ru | (707) 599 9668 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| Nty Exteriors | Nty Exteriors | service@ntyexteriors.com | (800) 891-6862 | Windows, patio, painters | Mckinleyville · Humboldt County | — | — |
| O & M Industries | Kenneth George Christen | info@omindustries.com | (707) 822 8800 | HVAC | Arcata · Humboldt County | — | — |
| O B D Plumbing | O B D Plumbing | — | (707) 672 6279 | Other | Eureka · Humboldt County | — | — |
| Oak And Iron Construction LLC | Kristian Erik Mohorovich | info@oakironconstruction.com | (707) 834 2327 | GC, remodel, ADU | Rio Dell · Humboldt County | — | — |
| Oasis Structures And Water Works | Rene Alicia Mack | — | (707) 845 4259 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |
| Offins General Engineering LLC | Ryan M Offins | — | (707) 496 4373 | Other | Hoopa · Humboldt County | — | — |
| Old Growth Construction LLC | Zachariah Moses Johnson | madrone@oldgrowthconstruction.com | (707) 616 7882 | GC, remodel, ADU | Eureka · Humboldt County | — | — |
| On Point Construction | Seth Daveed Gaynor | — | (707) 407 8512 | GC, remodel, ADU | Blue Lake · Humboldt County | — | — |
| Orion William Landis | Orion William Landis | — | (707) 845 4271 | GC, remodel, ADU | Mc Kinleyville · Humboldt County | — | — |