Fairfield Demographics Data
CERC is a non-profit economic development organization that publishes profiles of Connecticut towns, including Fairfield. CERC's Business Response Center can answer your questions if you need more specific information.
Other resources include the state Dept. of Economic and Community Development and the US Census web site - in addition to general statistics for Fairfield County as a whole, the Census Bureau has a well-hidden report on Fairfield (PDF) as well.
Note: To view PDF files, you'll need Adobe's free Acrobat Reader software. If you don't already have it on your computer, you can download it from the Adobe web site.