Every year, the U.S. Census Bureau contacts over 3.5 million households across the country to participate in the American Community Survey. Response to the survey (as with the Decennial Census) is legally required. There is a very wide range of questions asked by the ACS that can be categorized as either "People" or "Housing." You can learn more about the questions on the form and why the Census asks them.
Will you be looking at areas with a significant population of students living in dorms, seasonal residents, or areas with large group quarters like military bases or prisons? You might want to familiarize yourself with the ACS residence rules. For those interested in Charlottesville and Albemarle, note that students living in dorms or off-grounds may be included in the ACS.