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Total US population (all ages including armed service personnel) revised and dated through 12-01-08
305737 million – 12-01-08 – (calculated)
Last updated 2006 with explanation of how numbers were derived
Source US Dept of Commerce – Census Bureau
Number of IRS returns filed for 2006
2,507,728  (excludes S corporations)
Employment taxes 
Civilian labor force, 2006
Total number of firms, 2002
This is where I start – obviously somewhere there exists newer and more accurate numbers. Maybe in consumer focused industries? chamber of commerce? international knowledge of the US?
Next, I start looking around and thinking about where would need to have the real numbers . . .