| 5234 | Fasteners (except clothing), retail | |
| 5131 | Fasteners, clothing, wholesale | |
| 5143 | Fasteners, hardware, wholesale | |
| 3699 | Fasteners, slide or hookless, manufacturing | |
| 3312 | Fathometers, manufacturing | |
| 3312 | Fatigue testing machines, industrial, mechanical, manufacturing | |
| 1514 | Fats and oils, made from purchased fats and oils | |
| 1514 | Fats and oils, made in oilseed crushing mills | |
| 1511 | Fats animal (except poultry and small game), produced in slaughtering plants | |
| 2429 | Fatty acid esters and amines, manufacturing | |
| 2429 | Fatty acids (e.g., margaric, oleic, stearic), manufacturing | |
| 2411 | Fatty alcohols, manufacturing | |
| 2691 | Faucet handles, vitreous china and earthenware, manufacturing | |
| 2912 | Faucets, metal and plastics, manufacturing | |
| 2912 | Faucets, plumbing, manufacturing | |
| 2029 | Faucets, wood, manufacturing | |
| 1511 | Feather meal, manufacturing | |
| 1810 | Feather-filled clothing, men's and boys', cut and sewn from purchased fabric | |
| 1810 | Feather-filled coats, jackets and vests, women's and misses', cut and sewn from purchased fabric | |
| 3699 | Feathers, curling, dyeing and renovating, for the trade, manufacturing | |
| 3699 | Feathers, plumes and artificial flowers, manufacturing | |
| 3699 | Feathers, preparing for use in clothing and textile products | |
| 5121 | Feathers, unprocessed, wholesale | |
| 9220 | Feature syndicate | |
| 7513 | Federal aviation administration (including control) | |
| 7523 | Federal bureau of investigation | |
| 7513 | Federal communications commission | |
| 7523 | Federal correctional services | |
| 7523 | Federal court (Exchequer) | |
| 7523 | Federal court of equity | |
| 7523 | Federal court of law | |
| 6519 | Federal credit unions | |
| 6603 | Federal Crop Insurance Corporation | |
| 6603 | Federal Deposit Insurance Corporation | |
| 6592 | Federal government lending agency | |
| 6511 | Federal Home Loan Banks (i.e., liquidity and clearing services) | |
| 6592 | Federal Home Loan Mortgage Corporation | |
| 7521 | Federal immigration services | |
| 6592 | Federal Intermediate Credit Banks | |
| 6592 | Federal Land Banks | |