Yes, the state with the highest number of stores is California.
In terms of volume, I think all of the highest-grossing stores are in Minnesota with a few random high volume stores scattered throughout the nation. It makes sense because Target is the place where lots of people shop for food and essentials. Most stores there are supercenters, and there are more Targets than Walmarts.
Some of the largest stores by square footage are also in Minnesota, but the majority are found scattered throughout random states. I think the largest is the Ventura Mall store followed by the Annapolis store, the Glendale store, and then Target Edina. I could be wrong though.