They have cashless payments throughout the park. The parks have multiple Cash-to-Card kiosks located throughout to allow you to convert your cash to a prepaid card with no fee. Leftover funds can be used anywhere VISA is accepted.
There are six ATMs at Knott's Berry Farm. They are located: outside the Main Entrance near the ticket booths, at Lee's Last Stop Service store near Xcelerator, inside Classic Candy near the Charleston Fountain in the Boardwalk area, at Peppermint Patty's Candy Cabin in Camp Snoopy, inside the General Store in Ghost Town and at Emporium in the California Marketplace.