If you are looking for Census data for any of our localities or the Planning District, the best resource to explore first is the American Factfinder - Community Facts webpage. That page presents a wealth of data on population, age data, business/industry, education, housing, income, race and other subjects. If you call the SPDC office requesting general Census data or demographics for a location, tables found on that page are the same that would be sent to you.
Our suggestion is to see what you can find on that page, and if the scope of the data is not narrow enough, or you find yourself needing more detailed or obscure information, or you need to combine Census data with GIS maps, then please contact us and we'll work with you to find what you are looking for.
Our Data Book remains a good resource for data, although it is need of an update and that is being worked on as time permits.