The FDIC said 117 banks and thrifts were considered to be in trouble in the second quarter, up from 90 in the prior quarter.
The FDIC doesn't reveal the names of the banks on the list, but it does give the total assets of these institutions.
That number was $78.3 billion during the quarter, up sharply from $26.3 billion the previous quarter.
"More banks will come on the list as credit problems worsen and assets of problem institutions will continue to rise," said FDIC Chairman Sheila Bair in a press conference.
In its latest quarterly report on the industry, the F.D.I.C., also said earnings at banks and thrifts declined 86 percent from April to June, to $4.96 billion, from $36.8 billion a year earlier.