Answer:
Kansas
Step-by-step explanation:
The geographic center of the 48-states continental United States is located near the town of Lebanon, in the state of Kansas, close to the border with Nebraska.
While the geographic center of the whole United States, including Alaska and Hawaii is located near Belle Fourche, South Dakota.
Such measures are somewhat imprecise though due to the moving nature of the coastlines (with erosion or land-filling).