| Northwest Pipe Company CO | — | 0 | — | — |
| Northwest Pipe Company KS | — | 0 | — | — |
| NorthWest Pipe Company OR | Manufacturing | 0 | — | F |
| Northwest Pipe Company TX | Manufacturing | 0 | — | D |
| Northwest Pipe Fittings, Inc SD | Wholesale Trade | 0 | — | B |
| Northwest Pipe Fittings, Inc. MT | Wholesale Trade | 0 | — | F |
| Northwest Plumbing INC GA | Construction | 0 | — | F |
| Northwest Plumbing Jacksonville, INC. FL | Construction | 0 | — | F |
| NORTHWEST PLUMBING TAMPA, INC. FL | Construction | 0 | — | F |
| NorthWest Plywood sales of Oregon, Inc. DBA Precision Prefinishing OR | Manufacturing | 0 | — | F |
| Northwest Pump & Equipment Co OR | Wholesale Trade | 0 | — | B |
| Northwest Pump & Equipment Co WA | Wholesale Trade | 0 | — | F |
| Northwest Rebar IA | Construction | 0 | — | A |
| Northwest Regional Education Service District OR | Educational Services | 0 | — | C |
| Northwest Regional Foundation of Tillamook OR | Healthcare & Social Assistance | 1 | $93,558 | — |
| Northwest Regional Medical Center MS | — | 0 | — | — |
| Northwest Renal Clinic, Inc. OR | Healthcare & Social Assistance | 1 | $240,000 | — |
| Northwest Restoration Operating Inc. WA | Construction | 0 | — | F |
| Northwest Rubber Extruders Inc OR | Manufacturing | 0 | — | D |
| Northwest Scaffold Service Inc. OR | Construction | 0 | — | F |
| Northwest Service Cooperative MN | Educational Services | 0 | — | D |
| NORTHWEST SHIPPING ROOM SUPPLY, INC WA | Wholesale Trade | 0 | — | A |
| Northwest Sign & Design WA | Manufacturing | 0 | — | F |
| Northwest Steel IL | Manufacturing | 0 | — | F |
| Northwest Steel and Pipe, Inc. WA | Wholesale Trade | 0 | — | F |
| Northwest Steel Erection IA | Construction | 0 | — | C |
| Northwest Swissmatic LLC MN | Manufacturing | 0 | — | A |
| Northwest Technical College MN | Educational Services | 0 | — | F |
| Northwest Technologies, Inc. OR | Manufacturing | 0 | — | F |
| Northwest Tennessee Human Resource Agency TN | Public Administration | 0 | — | D |
| Northwest Tire Inc ND | Retail Trade | 0 | — | A |
| Northwest Tool & Machine, Inc. MI | Manufacturing | 0 | — | A |
| Northwest Tool & Manufacturing Inc WI | Manufacturing | 0 | — | A |
| Northwest Tower Crane Service, Inc. WA | Construction | 0 | — | F |
| NORTHWEST TRANSPORTATION INC CA | Transportation & Warehousing | 0 | — | A |
| NORTHWEST TRUCKS INC IL | Transportation & Warehousing | 0 | — | C |
| Northwest Trustee & Management Services WA | Finance & Insurance | 1 | $75,005 | — |
| Northwest Trustee Services, Inc. WA | — | 0 | — | — |
| Northwest UAV OR | Manufacturing | 0 | — | A |
| Northwest Youth Services WA | Healthcare & Social Assistance | 0 | — | F |
| Northwestern College IA | Educational Services | 1 | $53,499 | — |
| Northwestern Electric Cooperative OK | Utilities | 0 | — | C |
| NorthWestern Energy MT | Utilities | 0 | — | D |
| Northwestern Energy SD | Utilities | 0 | — | D |
| Northwestern Flavors LLC IL | Manufacturing | 0 | — | C |
| Northwestern Indiana Telephone Company IN | Construction | 0 | — | D |
| Northwestern Industries, Inc WA | — | 0 | — | — |
| NORTHWESTERN MEDICAL CENTER VT | Healthcare & Social Assistance | 4 | $87,045 | — |
| Northwestern Medical Faculty Foundation IL | Healthcare & Social Assistance | 6 | $231,159 | — |
| Northwestern Memorial HealthCare IL | Healthcare & Social Assistance | 42 | $100,091 | — |
