| 3230 | Projection televisions, manufacturing | |
| 2927 | Projectors (e.g., antisub, depth charge release, grenade, Livens, rocket), manufacturing | |
| 9214 | Promoters of arts events, with facilities | |
| 9214 | Promoters of arts events, without facilities | |
| 7499 | Promoters of home shows, flower shows | |
| 9214 | Promoters of live performing arts productions (e.g., concerts), with facilities | |
| 9214 | Promoters of live performing arts productions (e.g., concerts), without facilities | |
| 9241 | Promoters of sports events, with facilities | |
| 9241 | Promoters, sports events | |
| 9241 | Promoters, sports events, without facilities | |
| 7414 | Promotion service (business service) | |
| 7430 | Promotions | |
| 7499 | Proofreading service | |
| 1110 | Propane (natural) production | |
| 2812 | Propane gas cylinders, manufacturing | |
| 5239 | Propane gas sales and distribution | |
| 2320 | Propane gases, made in petroleum refineries | |
| 7130 | Propane tanks, commercial and residential, rental | |
| 5239 | Propane tanks, re-filling | |
| 3530 | Propeller blades, aircraft, manufacturing | |
| 2930 | Propeller fans, window-type (household), manufacturing | |
| 3430 | Propeller shaft assemblies, automotive, truck and bus, manufacturing | |
| 2922 | Propeller straightening presses, manufacturing | |
| 3312 | Propeller type meters with registers, manufacturing | |
| 3530 | Propellers, aircraft, manufacturing | |
| 2899 | Propellers, ship and boat, machined, manufacturing | |
| 6603 | Property and casualty insurance underwriters | |
| 6603 | Property and casualty insurers | |
| 6603 | Property damage insurance | |
| 7010 | Property development | |
| 4540 | Property maintenance services on contract | |
| 7020 | Property management, non residential | |
| 9199 | Property owners' association | |
| 6603 | Property reinsurance carriers | |
| 7411 | Property tax assessment consulting services | |
| 7511 | Property tax assessors' offices | |
| 2519 | Prophylactics, rubber, manufacturing | |
| 5139 | Proprietary (patent) medicines, wholesale | |
| 5231 | Proprietary medicines, retail | |
| 3530 | Propulsion units and parts, guided missile and space vehicle, manufacturing | |