Here are sources for Census data :
- Here is a guide to finding US Census data, including ACS data, using American FactFinder
- Here is a guide to using Social Explorer to generate maps using US Census data, including ACS data
- The NYC Census FactFinder is a valuable resource for determining neighborhood boundaries and accessing data for NY in particular
Here is an example of data in Excel set up in order to visualize trends (using data downloaded from Social Explorer).