The estimated jackpot includes an annuity figure and the cash alternative if you would prefer to take it as a lump sum. If there are multiple winners, it is split between them.
If you win the jackpot, the amount is the same no matter where you live or bought your ticket. The jackpot value is the same across all 48 jurisdictions where Powerball is played. The jackpot increases by $2 million per draw as a minimum, although it's typically a lot more in practice.
