| Parent Academy for Student Achievement | Academic & Science |
| Public Access to Science Act | Academic & Science |
| Pan-Arab Space Agency | Academic & Science |
| Publications of the Astronomical Society of Australia | Academic & Science |
| Projected Assessment Of System Adequacy | Business |
| QuePasa.Com, Inc. (delisted) | Business |
| Professional Air Sports Association | Business |
| Pilipino American Sports Association | Business |
| Publishers Association Of South Africa | Business |
| Police Association Of South Australia | Business |
| Parachute Association Of South Africa | Business |
| Polygraph Association of South Africa | Business |
| Program Approved Service Agency | Business |
| Purchasing and Supply Agency | Business |
| Participating Agency Service Agreement | Business |
| Performing Arts San Antonio | Community |
| Providence After School Alliance | Community |
| Pennsylvania Association of School Administrators | Community |
| Professional and Administrative Staff Association | Community |
| Professional Administrative Staff Association | Community |
| Pickerington Area Soccer Association | Community |
| Pennsylvania Association for | Community |
| Pan American Surf Association | Community |
| Pilipino American Student Association | Community |
| PA Association of School Administrators | Community |
| Payment Association of South Africa | Community |
| Philippine American Student Association | Community |
| Public Admin Student Association | Community |
| Public Administration Student Association | Community |
| Pennsylvania Ambulatory Surgery Association | Community |
| Professional Automobile Sales Association | Community |
| Peninsula Australian Shepherd Association | Community |
| Parents And School Association | Community |
| Program Automatic Storage Area | Computing |
| Pennsylvania Association for Sustainable Agriculture | General |
| PolyAmide, Semi- Aromatic (Nylon) | General |
| Portland Area Sys Admins | General |
| Pennsylvania Alternate System of Assessment | General |
| Population and Survey Analysts | General |
| Palo Alto Stanford Aquatics | General |
| Public Art San Angelo | General |
| Public Art San Antonio | General |
| Pharmacotherapies for Alcohol and Substance Abuse | General |
| PA Alternate System of Assessment | General |
| Posterior Anterior Shift in Aging | General |
| Panasonic Automotive Systems America | General |
| Prevention of Anti-Social Activity | Governmental |
| President Appoints, Senate Approves | Governmental |
| Piedmont Area Singletrack Alliance | Governmental |
| Pan African Sanctuary Alliance | Governmental |
| Philadelphia Area Songwriters Alliance | Governmental |
| PARASSALA | Indian Railway Station |
| Primary Acquired Sideroblastic Anaemia | Medical |
| Purchasing And Supply Agency (NHS Purchasing And Supply Agency) | Medical |
| Punks and Skaters Association | Sports |
