After nine days of deliberations, the unanimous verdict of not guilty was reached on count three, in which Edwards was charged with receiving contributions from donor Bunny Mellon in excess of federal campaign contribution limits, according to CNN.
The judge declared a mistrial on the remaining counts after the jury said it was deadlocked, The Associated Press reported.
The ex-senator was charged last June with violating campaign-finance laws during his 2008 presidential campaign by accepting the more than $900,000 from two donors to conceal his mistress, according to the Wall Street Journal.
Defense attorneys have said Edwards did not knowingly break campaign finance laws. They also claimed the payments to hide his mistress Rielle Hunter were gifts, not campaign contributions.
If found guilty of all six counts, Edwards faced up to 30 years in prison and a $1.5 million fine. Each individual count carries a maximum sentence of five years and up to $250,000, MSNBC reported.