| NATIONAL PLANT SERVICES, INC. CA | Administrative & Waste Services | 0 | — | A |
| National Plastek, Inc. MI | Manufacturing | 0 | — | A |
| National Plastics & Seals. INC FL | Wholesale Trade | 0 | — | A |
| National Plastics & Seals. INC IL | Wholesale Trade | 0 | — | A |
| National Plastics & Seals. INC TX | Wholesale Trade | 0 | — | A |
| National Plastics Color, Inc KS | Manufacturing | 0 | — | F |
| National Polishing System, Inc. OH | Construction | 0 | — | A |
| NATIONAL POLISHING SYSTEMS, INC. OH | Construction | 0 | — | A |
| National Polymers MN | Manufacturing | 0 | — | F |
| National Pool Partners Inc. AZ | Administrative & Waste Services | 0 | — | F |
| National Pool Partners Inc. FL | Administrative & Waste Services | 0 | — | F |
| National Pool Partners Inc. TX | Administrative & Waste Services | 0 | — | F |
| National Power Corporation IL | Manufacturing | 0 | — | A |
| National Power LLC NC | Construction | 0 | — | A |
| National Power Rodding Corp. IL | Administrative & Waste Services | 0 | — | D |
| National Power, LLC AZ | Construction | 0 | — | B |
| National Precast, Inc. MI | — | 0 | — | — |
| National Precisionaire LLC TX | Construction | 0 | — | A |
| National Presort, LLC TX | Manufacturing | 0 | — | F |
| National Presto Industries, Inc WI | Manufacturing | 0 | — | A |
| National Product Sales, Inc. (The NPSstore) UT | Wholesale Trade | 0 | — | F |
| National Products, Inc. WA | Manufacturing | 0 | — | F |
| National Public Radio, Inc. DC | Information & Media | 1 | $110,968 | — |
| National Pump Company CA | Manufacturing | 0 | — | F |
| National Pump Company FL | Manufacturing | 0 | — | A |
| National Pump Company TX | Manufacturing | 0 | — | A |
| National Quality Systems, Inc. FL | Information & Media | 1 | $120,000 | — |
| National Radio Astronomy Observatory VA | Professional & Technical Services | 10 | $100,342 | — |
| National Railroad Passenger Corporation DC | Transportation & Warehousing | 16 | $133,243 | — |
| National Railroad Passenger Corporation (Amtrak) WA | — | 0 | — | — |
| National Railway IL | Manufacturing | 0 | — | F |
| National Railway KY | Manufacturing | 0 | — | F |
| NATIONAL RAILWAY EQUIPMENT (NRE) LA | Wholesale Trade | 0 | — | C |
| National Railway Equipment Co. IL | — | 0 | — | — |
| National Real Estate Information Services PA | — | 0 | — | — |
| National Recoveries 2020 MN | — | 0 | — | — |
| National Recoveries 2021 MN | — | 0 | — | — |
| National Recovery Staffing FL | Healthcare & Social Assistance | 0 | — | C |
| National Refacing Systems PA | Construction | 0 | — | A |
| National Refrigerants Inc. NJ | Wholesale Trade | 0 | — | F |
| National Refrigeration & A/C Products PA | Manufacturing | 0 | — | F |
| National Refrigeration and Air Conditioning PA | Wholesale Trade | 0 | — | A |
| National Refrigeration Products PA | Wholesale Trade | 0 | — | A |
| National Regency of New Berlin Inc. WI | — | 0 | — | — |
| National Rehabilitation Hospital, Inc. DC | Healthcare & Social Assistance | 4 | $89,705 | — |
| National Renewable Energy Corporation NC | Utilities | 0 | — | D |
| National Research Corporation NE | Professional & Technical Services | 2 | $88,250 | — |
| National Research Group, Inc. CA | Professional & Technical Services | 2 | $130,000 | — |
| National Resilience CA | Manufacturing | 0 | — | C |
| National Resilience MA | Manufacturing | 0 | — | F |
