That’s why I like this interactive map that is driven from data from the US census.
If you are including average household income in your marketing plan and your business is geographically based, you may find this interactive map that uses census data to isolate counties and tracts within the county by income extremely helpful.
It allows you to have a visual analysis of average income which could be a handy tool in creating your marketing program in your business plan.
The tool includes the enlarge and reduce map components with the Google guy (the little orange/yellow figure that you can drag into the map to get a visual of walking or driving in the area.)
I could imagine if you were trying to figure out an EDDM mailing or where to open your next store, this could be a real help!