This map shows where every McDonald’s is in the contiguous United States.
[From Weather Sealed via Neatorama]
And this is a satellite image of the U.S. taken at night.
Basically, if your city’s luminescence can be seen from space, then you have a McDonald’s (whose golden arches contribute to said luminosity).
And if you are wondering, the farthest you can be from a McDonald’s is 107 miles as the crow flies, or 145 miles by car.