What does JPJ stand for?

Justice of the Peace and Local Government Review - A publication (DLA)

Justice of the Peace Journal - A publication

Justice of the Peace. Weekly Notes of Cases - England - A publication (DLA)

Palmer Johnson Sports Yachts, Sturgeon Bay, WI - Manufacturer code for watercraft hull identification number (USCG)

Paterson, NJ - Location identifier - FAA (FAAL)