"Your source for population, housing, economic, and geographic information." Use American FactFinder to discover data from key Census surveys, including the American Community Survey, the Decennial Census, the Economic Survey, to name but a few. A complete list of Census surveys discoverable in American FactFinder is available here.
"Open government data is important because the more accessible, discoverable, and usable data is the more impact it can have..."
"A data management plan (DMP) is a document that describes how you will treat your data during a project and what happens with the data after the project ends..." Michener, W. K. (2015). Ten Simple Rules for Creating a Good Data Management Plan. PLoS Comput Biol, 11(10), e1004525.