It’s not an American college town. Apparently, Eastern Germany wins the prize:

The statistics are most striking among those under 28 years old: more than 71% of eastern Germans in this age group say they have never believed in the existence of God. That’s nearly as many as in the 38-47 group, of which 72.6% are non-believers.
What the figures mean is that in eastern Germany, very young people are on the same wavelength as people from the middle generation when it comes to belief in God. The political transformation of former East Germany, in other words, hasn’t had much of an effect on people’s ideas about religion. While there are somewhat fewer atheists among young adults aged 28 to 37, where “only” 63.6% say they’ve never been believers, those in the following generation are at least as non-religious as their parents.
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Because results for Germany were divided into East and West, it emerged that former East Germany was by far the most atheistic region on the planet. There, 52.1% of those asked agreed with the statement: “I don’t believe in God.”

This is all according to a new study called “Beliefs about God across Time and Countries” (PDF) conducted by the National Opinion Research Center (NORC) at the University of Chicago.
America has a long way to go…