The person who bought the ticket at an undisclosed location in Fairfield County has until April 30 to come forward and claim the prize.
The jackpot is the biggest ever in Connecticut and the 12th largest in Powerball history.
Several rumors have been swirling about people who lost winning tickets, but Connecticut Lottery Corporation spokeswoman Linda Tarnowski says that so far nobody has contacted lottery officials to make a claim.
In addition to the billboard campaign officials are using display screens at 2,700 retailers across the state to urge people to check their tickets.
