The debt includes the $11 million that the New York senator lent the campaign, The New York Post reported Thursday.
Clinton owes about $200,000 to firms in her home state, including $100,000 to the Spoken Hub in New York for phone-banking fees, Federal Elections Commission filings show.
The campaign owes more than $42,000 for consulting fees to Bill Lynch Associates -- a Harlem, N.Y., run by a former New York deputy mayor who served in 2004 as a deputy campaign manager for the Democratic ticket of John Kerry and John Edwards.
Lynch told the newspaper he is not worried about collecting.
"I'm not concerned for a minute," he said, adding that Clinton "seems to have the ability" to raise enough money for her debt.
Clinton's campaign owes the most -- nearly $5 million -- to Penn, Schoen & Berland Associates, the Washington market research and consulting firm founded by her campaign's former chief strategist Mark Penn.
"I've been working with the Clintons for 10 years and they've always paid their bills," Penn said.