| 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 Equipment Co. IL | - | 0 | - | - |
| National Real Estate Information Services PA | - | 0 | - | - |
| National Recoveries 2020 MN | - | 0 | - | - |
| National Recoveries 2021 MN | - | 0 | - | - |
| National Refrigerants Inc. NJ | Wholesale Trade | 0 | - | F |
| National Refrigeration & A/C Products PA | Manufacturing | 0 | - | F |
| National Regency of New Berlin Inc. WI | - | 0 | - | - |
| National Rehabilitation Hospital, Inc. DC | Healthcare & Social Assistance | 4 | $89,705 | - |
| National Research Corporation NE | Professional & Technical Services | 2 | $88,250 | - |
| National Research Group, Inc. CA | Professional & Technical Services | 2 | $130,000 | - |
| National Resilience MA | Manufacturing | 0 | - | F |
| National Retail Transportation, Inc. CA | - | 0 | - | - |
| National Rubber CORPORATION PA | Manufacturing | 1 | $81,869 | - |
| National Rural Electric Cooperative Association VA | Other Services | 1 | $134,992 | - |
| National Safety Apparel KS | - | 0 | - | - |
| National Safety Apparel OH | Manufacturing | 1 | $69,768 | B |
| National Safety Apparel Inc. IL | Manufacturing | 0 | - | C |
| National Seating & Mobility, Inc. TN | - | 0 | - | - |
| National September 11 Memorial & Museum NY | - | 0 | - | - |
| National Signal CA | Manufacturing | 0 | - | F |
| National Soft Systems INC. AR | Professional & Technical Services | 2 | $76,783 | - |
| National Spinning Co. Inc. NC | - | 0 | - | - |
| National Standard, LLC MI | Manufacturing | 0 | - | F |
| National Steel and Shipbuilding Company CA | Manufacturing | 1 | $163,250 | - |
| National Student Clearinghouse VA | Educational Services | 2 | $175,990 | - |
| National Systems America L.P. TX | Professional & Technical Services | 2 | $105,997 | - |
| National Taxpayers Union Foundation DC | Other Services | 1 | $118,310 | - |
| National Test Pilot School CA | Educational Services | 1 | $180,000 | - |
| National Tobacco Co. KY | - | 0 | - | - |
| National Tropical Botanical Garden HI | Arts & Entertainment | 1 | $50,066 | - |
| National Tube Supply IL | Wholesale Trade | 0 | - | F |
| National Union Fire Insurance Company of Pittsburgh, Pa. NJ | Finance & Insurance | 7 | $103,276 | - |
| National University CA | Educational Services | 0 | - | A |
| National Vinyl, LLC MA | Manufacturing | 0 | - | F |
| National Vision, Inc. GA | Healthcare & Social Assistance | 6 | $106,021 | - |
| National Vision, Inc. NJ | - | 0 | - | - |
| National Vision, Inc. (operating Walmart Vision Care) HI | - | 0 | - | - |
| National Warehouse Management, LLC CA | Wholesale Trade | 0 | - | F |
| National Water Main Cleaning CO NJ | Administrative & Waste Services | 1 | $150,000 | F |
| National Water Main Cleaning Company MA | Administrative & Waste Services | 0 | - | C |
| National Wood Products UT | Wholesale Trade | 0 | - | D |
| National Youth Advocate Program FL | Healthcare & Social Assistance | 0 | - | C |
| National Youth Advocate Program OH | Healthcare & Social Assistance | 0 | - | C |
| Nations Cabinetry TX | Manufacturing | 0 | - | F |
| Nations Info Corporation CA | Information & Media | 3 | $97,572 | - |
| Nations Lending Corporation OH | - | 0 | - | - |
| NationsBenefits, LLC CA | Wholesale Trade | 0 | - | D |
