Six southern Minnesota residents — including three from Albert Lea — have pleaded guilty in federal court to their involvement in a counterfeit ring.

The scheme targeted businesses along the Interstate 35 corridor between the Twin Cities and the Iowa border.

Albert Lea resident Heather Ann Cameron, 34, pleaded guilty Thursday to one count of counterfeiting U.S. currency.

In her plea agreement, Cameron admitted that from December 2010 through June 2011, she chemically washed $5 bills and reprinted them as $100 bills. She said she intended to defraud businesses by passing the bills and then receiving money and goods in return.

Her husband, Travis Allen Cameron, 31, of Albert Lea pleaded guilty Monday to the same count, admitting that he produced altered bills.

Meranda Lynn O’Connor, 29, of Albert Lea pleaded guilty Oct. 20 to one count of uttering altered currency, admitting that between Dec. 21, 2010, and Jan. 1 she passed the altered money at businesses in Bloomington and Burnsville.

Also entering pleas were the following:

• Sarah Ann Wood, 27, of Owatonna, pleaded guilty Monday to one count of uttering altered currency. Wood admitted to using the counterfeit bills at five Mankato businesses in May.

• Eric Michael Dorman, 34, of Fairmont, pleaded guilty Oct. 20 to one count of counterfeiting, admitting he produced altered bills in May and June.

• Vincent Dwayne Tampio, 33, of Faribault, pleaded guilty Oct. 20 to one count of counterfeiting, admitting he produced altered bills in May and June.

Co-defendant Dustin David Hanson, 34, of Northfield, entered a guilty plea earlier this month, and co-defendant Daniel Jay Wilson, 27, of Owatonna, did so in September.

Each defendant faces a maximum penalty of 20 years in prison.

The sentencing hearings have not been scheduled yet.