| Natural Resources | Natural Resources | 252 |
| Environment/Superfund | Environment/Superfund | 209 |
| Real Estate/Land Use/Conservation | Real Estate/Land Use/Conservation | 118 |
| Clean Air and Water (quality) | Clean Air and Water (quality) | 53 |
| Budget/Appropriations | Budget/Appropriations | 45 |
| Urban Development/Municipalities | Urban Development/Municipalities | 34 |
| Government Issues | Government Issues | 33 |
| Roads/Highway | Roads/Highway | 33 |
| Agriculture | Agriculture | 29 |
| Transportation | Transportation | 22 |
| Housing | Housing | 18 |
| Homeland Security | Homeland Security | 17 |
| Defense | Defense | 15 |
| Marine/Maritime/Boating/Fisheries | Marine/Maritime/Boating/Fisheries | 11 |
| Small Business | Small Business | 8 |
| Chemicals/Chemical Industry | Chemicals/Chemical Industry | 7 |
| Disaster Planning/Emergencies | Disaster Planning/Emergencies | 7 |
| Energy/Nuclear | Energy/Nuclear | 4 |
| Foreign Relations | Foreign Relations | 3 |
| Gaming/Gambling/Casino | Gaming/Gambling/Casino | 3 |