I'm working on an EIS at the moment, and I'm not too familiar with the process. All of the examples I've found use Census data for population, race, income, etc. And while I can certainly access the Census data, it's obviously been a while since the last one and the ACS and other smaller Census studies don't cover this area of the country to the detail that I need
Is there any reason why I wouldn't be able to use third party demographic data (Demographics Now, Claritas, etc.) to get more recent demographic data?