The American Community Survey (ACS) is an annual survey conducted by the Census Bureau since 2005. The ACS asks questions on a wide array of social, economic, housing, and demographic characteristics and was designed to replace the Decenniel Census "long form"
Information on annuall, 3-year and 5-year releases.
I am in a hurry: Social Explorer
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Data.census.gov also has a microdata portal in beta version