| 2423 | Patent medicine preparations, manufacturing | |
| 5231 | Patent medicines, retail | |
| 5139 | Patent medicines, wholesale | |
| 6599 | Patent owners | |
| 6599 | Patent trusts, other | |
| 6599 | Patent trusts, trust companies | |
| 8512 | Pathologists (M.D.), offices of | |
| 8512 | Pathologists, oral, offices of | |
| 8512 | Pathologists, private practice | |
| 3311 | Patient monitoring equipment (e.g., intensive care, coronary care unit), manufacturing | |
| 5150 | Patient monitoring equipment, wholesale | |
| 2695 | Patio blocks, concrete, manufacturing | |
| 4520 | Patio construction, concrete, contractors | |
| 5139 | Patio furniture, wholesale | |
| 4520 | Patio stone work | |
| 3511 | Patrol boats, building | |
| 7492 | Patrol services, security | |
| 7523 | Patrol, fishery | |
| 7499 | Patroling (i.e., visual inspection) of electric transmission or gas lines | |
| 2922 | Pattern makers' machinery, woodworking, manufacturing | |
| 2929 | Patterns (except shoe), industrial, manufacturing | |
| 3699 | Patterns and models, all materials, manufacturing | |
| 2221 | Patterns and plans, printing without publishing | |
| 5139 | Patterns, clothing, wholesale | |
| 2219 | Patterns, paper (i.e., clothing), publisher | |
| 2219 | Patterns, paper (i.e., clothing), publishing | |
| 2219 | Patterns, paper (i.e., clothing), publishing and printing combined | |
| 5139 | Patterns, paper, wholesale | |
| 3699 | Patterns, shoe, manufacturing | |
| 5150 | Pavers, wholesale | |
| 4520 | Paving (asphalt), residential driveways and commercial parking lots | |
| 2699 | Paving blocks and mixtures, made from purchased asphaltic materials | |
| 2695 | Paving blocks, concrete, manufacturing | |
| 2696 | Paving blocks, cut stone, manufacturing | |
| 2693 | Paving brick, clay, manufacturing | |
| 4520 | Paving construction, contractors | |
| 4520 | Paving contracting, on construction projects | |
| 5143 | Paving mixtures, wholesale | |
| 4520 | Paving repair work on highways | |
| 4520 | Paving with concrete | |