Data-Planet is a database of standardized & structured statistical data. The first two links below provide access to the database and the third is a help guide about the database.
PolicyMap currently offers over 15,000 indicators related to demographics, real estate, city crime rates, health, schools, housing affordability, employment, energy, and public investments.
USAFacts is a data-driven portrait of the American population, the government's finances, and government's impact on society. Their data comes from publicly available government sources.
Substance Abuse and Mental Health Data Archive is an initiative funded under contract HHSS2832015000001C with the Center for Behavioral Health Statistics (CBHSQ), Substance Abuse and Mental Health Services Administration (SAHMHSA), U.S. Department of Health & Human Services (HHS).