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Esri ArcGIS Online is a web mapping platform that allows you to easily create, edit, analyze, share and publish geospatial data. To read about all that ArcGIS Online has to offer, check out its official website. The U-Spatial Help Desk offers training sessions.
data.census.gov is now the primary platform to access data and digital content from the U.S. Census Bureau, including the American Community Survey, the American Housing Survey, The Decennial Censuses (10 year surveys), Economic Census and Census Bureau surveys.