By Emily Kaiser

WASHINGTON, Nov 12 (Reuters) - Not sure what to give Uncle Sam this Christmas? How about a nice, fat check to help whittle away at the $7.6 trillion national debt?

The U.S. Treasury Department accepts gifts, payable to the Bureau of the Public Debt. Just mail them to the attention of Department G, Post Office Box 2188, Parkersburg, West Virginia, 26106-2188. Make a note in the memo section that it is a gift to reduce the debt held by the public.

Yes, really.

It's all on the Treasury's website, at the end of the list of frequently asked questions. here

Which raises a few more questions. Do people really send in checks? How much and what reasons do they give for voluntarily paying more than just their taxes? And why are the checks directed to a post office box in West Virginia?

According to Treasury spokesman Kim Treat, people do send checks. In the last fiscal year they added up to a little over $3 million, which was the highest total since at least 1996.

Some include notes. Common reasons for donating include a sense of patriotism and immigrants expressing their thanks to the United States for giving them an opportunity, he said.

The growing debt burden has become a more pressing political issue this year as the White House strains to pull the economy out of a deep recession and bring the jobless rate down from its current 26-year high of 10.2 percent.