| Actresses and Actors | O'Haras in show business. Maureen, David and others |
| Artists | O'Hara artists, painters, sculptors, etc. |
| Authors & Writers | O'Hara authors and O'Haras in literature |
| Businesses | O'Hara businesses and entrepreneurs |
| Characters | Noteworthy O'Hara characters and individuals |
| Clerics | O'Hara priests and clergymen |
| Educators | O'Hara educators and schools |
| Families | O'Hara families |
| Lifestyle | O'Haras and their lifestyle |
| Musicians | O'Hara musicians and musical artists |
| Personal | Personal web sites and web pages schools |
| Politicians | O'Haras in political, public and judicial life |
| Professionals | O'Haras in the professions |
| Scholars | O'Hara professors and academics |
| Scientists | O'Haras in science, medicine and technology |
| Soldiers | O'Haras in military service |
| Sportspeople | O'Hara sportsmen and sportswomen |
| World & Regional | O'Haras in various countries, states and regions |