Geographic Centre of the United States of America
Looking online I was able to find the area and geographic centre of each state (and the District of Columbia which is apparently so not a state they wont mention it on netstate.com). Obviously the answer is only as accurate as the data I started with.
Geographic Centre of the 48 Continuous States
98° 54.8 W and 38° 39.1 N
Geographic Centre of the 50 States
108° 21.8 W and 43° 7.2 N
For those who care the formulas I used are:
You can look at the excel file I used by clicking here.