Among the few certainties, we know that: * Calvin lives in the United States. * The town is vaguely similar in some regards to Watterson's home town of Chagrin Falls, Ohio. * It is explicitly stated that Calvin lives neither in Florida, California, North Dakota, Arizona, Alaska, Hawaii or The Yukon. * He lives in a state where it snows in the winter. * Arizona is generally to the west. * Buckeyes can be found in his neighborhood, which are native to the Midwest.