| History of Science and Medicine | 58 |
| Race, History, and American Society | 57 |
| Historical Studies and Socio-cultural Analysis | 50 |
| Urban, Neighborhood, and Segregation Studies | 42 |
| Diverse Historical and Scientific Studies | 40 |
| American History and Culture | 38 |
| Crime Patterns and Interventions | 35 |
| Urban Transport and Accessibility | 34 |
| American Environmental and Regional History | 26 |
| American Constitutional Law and Politics | 26 |
| Vietnamese History and Culture Studies | 23 |
| Homelessness and Social Issues | 21 |
| Music History and Culture | 20 |
| Cinema and Media Studies | 20 |
| Urban Planning and Governance | 18 |
| Urbanization and City Planning | 16 |
| Genomics and Phylogenetic Studies | 16 |
| Transportation Planning and Optimization | 16 |
| Housing Market and Economics | 16 |
| Gastroesophageal reflux and treatments | 15 |