Pennsylvania Lottery officials announced the ticket for Wednesday's drawing was sold at the Giant Foods located at 10 E. Ridge Pike in Conshohocken.
The ticket matched all five balls: 17-19-25-31-40.
The supermarket will receive a $500 bonus for selling the winning ticket.
Lottery officials cannot confirm the identity of the winner until the prize is claimed and the ticket is validated.
Cash 5 winners have one year from the drawing date to claim prizes.
Officials encourage the holder of the winning ticket to sign the back of the ticket, call the Lottery at 717-702-8146 and file a claim at any of Lottery's seven area offices or at Lottery headquarters in Middletown, Dauphin County.
Claims may be filed Monday through Friday from 8:30 a.m. to 4:30 p.m. at area offices and at headquarters from 8 a.m. to 4 p.m.