Pretty much everywhere, except for Hawaii, Alaska, and the “Four Corners” region where Utah, Colorado, New Mexico, and Utah meet.Just off the top of my head, there’s Colorado, Wyoming, Nebraska; Colorado, Wyoming, Utah; and Colorado, Oklahoma, Kansas
This strip has been in reruns for several years. Because of that, there is no connection between the timeline of the strip and the timeline of the real world.
“Cartoon physics”!