Yes, if you see multiple states listed then the jackpot was split by winning tickets sold in those states.
The thing with the Wikipedia info is that lottery jackpot amounts and other data is not like copyrighted material. It's just numbers that need to be tracked down.
For years there were bad jackpot numbers included in all the "top 25" jackpot lists, because nobody ever took the time to research what the actual jackpot tally was after the draw. This was especially true for cash values, and especially true for Mega Millions — because unlike Powerball, Mega Millions does not advertise the actual jackpot during the live drawing program.
So I took the time to go back and research all the past jackpots — both cash and annuity values. When someone reads a Lottery Post news story and copies the jackpot amounts into a Wikipedia page, that's not a copyright violation because they are just numbers. But what they should do is provide a credit on the Wiki page stating that they got the information from Lottery Post (with a link to the source). Several Wiki pages are guilty of this, over and over.
In the past I think they begrudgingly gave Lottery Post a credit for an obvious copying of our information. But it was not until the mods of the page first deleted a credit, and then was forced to put it back when I proved the information came from Lottery Post. (Or maybe I'm thinking of a credit to USA Mega — but the point was that it was like pulling teeth to get a credit.)
For the top jackpots list on Wikipedia, they included jackpot amounts I updated a while back, but missed some of the later updates I made with new information that I tracked down. So their list contains some errors.
The bottom line is that if you go back through the history of changes to the page you will notice that they update jackpot amounts without providing any citation of where the change came from. They just change the number. That's antithetical to the way a wiki is supposed to operate, and the lifting of Lottery Post data without proper credit is pathetic.