parcels office
• parole officer
• par ordre (French: by order)
• Passport Office
• Patent Office
• personnel officer
• petty officer
• Philharmonic Orchestra
• pilot officer
• Portsmouth (postcode or British vehicle registration)
• postal order
• Post Office
• power-operated
• Chem. propylene oxide
• Province of Ontario
• public office(r)
• Pyrénées-Orientales (department of France)