DeMarco can't yet say where it was purchased.
The person who holds it stands to earn about $8.1 million a year, before taxes, for the next 26 years as an annuity.
The cash option is worth about $137 million before Uncle Sam's share is extracted.
The largest Mega Millions jackpot of $390 million was March 6, 2007, shared by winners in New Jersey and Georgia.
The game also includes Virginia, Illinois, Maryland, Massachusetts, Michigan, New York, Ohio, Texas, Washington state and California.
The winning numbers were: 26, 32, 35, 43, 52 and the Mega Ball was 10.
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