2 Answers

The top ten. Lake Michigan is easily the largest. It is nearly three times larger than the next nine COMBINED.

Lake Michigan 22,300 square miles Michigan-Wisconsin-Illinois-Indiana
Great Salt Lake 2,117 Utah
Iliamna Lake 1,014 Alaska 
Lake Oahe (manmade) 685 North Dakota-South Dakota
Lake Okeechobee 662 Florida
Lake Pontchartrain 631 Louisiana
Lake Sakakawea (manmade) 520 North Dakota
Becharof Lake 453 Alaska
Red Lake 427 Minnesota
Selawik Lake 404 Alaska

However, other Great Lakes are partially in the United States. See below.

Lake Superior 31,700 square miles Michigan-Minnesota-Wisconsin-Ontario 
Lake Huron 23,000 Michigan-Ontario
Lake Erie 9,910 Michigan-New York-Ohio-Pennsylvania-Ontario
Lake Ontario 7,340 New York-Ontario

why don't you answer my question?