The largest Powerball jackpot ever won was $2.04 billion, and it was won by a single ticket in California on November 8, 2022. Here are the top 5 largest Powerball jackpots ever won:

1. $2.04 billion, Powerball, Nov. 8, 2022 (one ticket, from California)
2. $1.586 billion, Powerball, Jan. 13, 2016 (three tickets, from California, Florida, Tennessee)
3. $1.537 billion, Mega Millions, Oct. 23, 2018 (one ticket, from South Carolina)
4. $1.35 billion, Mega Millions, Jan. 13, 2023 (one ticket, from Maine)
5. $1.337 billion, Mega Millions, July 29, 2022 (one ticket, from Illinois)

It is worth noting that the largest lottery jackpot ever won in the United States was the $1.76 billion Powerball jackpot on October 13, 2023, but this information was not available in the search results at the time of writing.