smack in the middle of the US

I often tell people I'm from Kansas, right in the middle of the United States. Some agree, some don't say anything, and some question it. So here's the research: the geographic center of the first 48 states of the US (what I'm usually thinking with this statement) is 4 miles outside of Lebanon, KS. That is a six hour drive from my hometown. Of interest is the geographic center of the 50 states in Butte County, South Dakota and the geographic center of North America is close to Rugby, North Dakota.