The Math: August 2009 numbers
Federal workforce: 2,823,777
State & Local workforce: 19,808,604
labor force Aug 2009 154,577,000 employed 139,649,000
16.2% of workers work for the government.
Total government dependency is therefor approximately 51.2% of Americans.
Yes, these numbers are not apples to apples, but there is a reason such numbers are not available.