| H | Social sciences (general) | |
| HA | Statistics | |
| HB | Economic theory; Demography | |
| HC | Economic history and conditions | |
| HD | Industries; Land use; Labor | |
| HE | Transportation and communications | |
| HF | Commerce | |
| HG | Finance | |
| HJ | Public finance | |
| HM | Sociology (general) | |
| HN | Social history and conditions; Social problems; Social reform | |
| HQ | The family; Marriage; Woman | |
| HS | Societies: secret, benevolent, etc. | |
| HT | Communities; Classeses; Races | |
| HV | Social pathology; Social and public welfare; Criminology | |
| HX | Socialism; Communism; Anarchism |