| 6021 | Passenger transit systems, urban and suburban | |
| 6010 | Passenger transportation services, railway | |
| 6220 | Passenger transportation, air charter service | |
| 6220 | Passenger transportation, air, nonscheduled charter service | |
| 6120 | Passenger water transportation on rivers and canals | |
| 7494 | Passport photography services | |
| 7521 | Passport services | |
| 2925 | Pasta making machinery (i.e., food manufacturing type), manufacturing | |
| 1549 | Pasta mixes, made from purchased dried ingredients | |
| 1544 | Pasta mixes, made in dry pasta plants | |
| 1544 | Pasta, dry, manufacturing | |
| 1544 | Pasta, fresh, manufacturing | |
| 1544 | Pasta-based products, canning | |
| 2710 | Paste, iron or steel, made in steel mills | |
| 2720 | Paste, made from purchased copper | |
| 2710 | Paste, made from purchased iron or steel | |
| 2720 | Paste, non-ferrous metal (except aluminum, copper), made from purchased metals | |
| 5149 | Pasted chipboard (paperboard), wholesale | |
| 3699 | Pastels (artists' crayons), manufacturing | |
| 3699 | Pastels, artists', manufacturing | |
| 2429 | Pastes, adhesive, manufacturing | |
| 1513 | Pastes, fruit and vegetable, canning | |
| 2925 | Pasteurizing equipment (i.e., food manufacturing type), manufacturing | |
| 1511 | Pastrami, made from purchased meat | |
| 1541 | Pastries (e.g., Danish, French), fresh, made in commercial bakeries | |
| 1541 | Pastries (e.g., Danish, French), frozen, manufacturing | |
| 1541 | Pastries (e.g., Danish, French), made in commercial bakeries | |
| 1531 | Pastries, uncooked, made from purchased flour | |
| 5122 | Pastries, wholesale | |
| 2029 | Pastry boards, wood, manufacturing | |
| 1531 | Pastry mixes, prepared, made from purchased flour | |
| 5220 | Pastry shops, without baking on the premises, retail | |
| 5122 | Pastry, quick-frozen, packaged, wholesale | |
| 7411 | Patent agent services (i.e., patent filing and searching services) | |
| 7411 | Patent attorneys, private practice | |
| 7411 | Patent broker services (i.e., patent marketing services) | |
| 6599 | Patent buying and licensing | |
| 6599 | Patent holders | |
| 6599 | Patent leasing | |
| 1911 | Patent leather, manufacturing | |