Finding government reports and statistics can be a bit of digging because every interface is different. I've organized them here for your different topics, but many can be used interchangeably.
Data.gov primarily hosts federal government data, but will also contain details of data from local, state, and tribal governments that allows such data to also be discoverable. Contains data on a variety of subjects and is searchable by subject.
Science.gov searches over 36 databases and 1,850 selected websites, offering 200 million pages of authoritative U.S. government science information, including research and development results.