We're up to about 320 million now, aren't we? So if revenue for fiscal year 2013 is around 2.7 trillion, that's about $8,400 per person.
Problem is, this includes a boatload of corporate tax which is difficult to calculate how much you pay - it's just buried in the price of everything you purchase. I'd estimate I've covered the share of my kids plus at least 5 or 6 freeloaders.
An easier comparison is just federal income tax, receipts estimated to be about 1.2 trillion for FY 2013. That's about $3750 per person.