Forsyth County was one of the 5 fastest growing counties in the USA between 1990 and 2000. Its population rose from 44,000 to 98,000 in 10 years. This explains the numerical side of its awful vote totals, but not its hyper-partisan nature. The most Republican county in Georgia? I'm sure its great to live there, but that distinction alone makes it a hella bad place.
What is it about brand new suburban developments that make them so extremely Republican? 97 of the 100 Fastest growing counties in 2004 voted for Bush. Part of this is explained by the Democratic vote being heavily concentrated in large counties, while the GOP vote is spread out over smaller ones, but thats a still a stunning statistic.
Gwinnett County, on the other hand, is way cooler.
Brand new suburban developments are populated by people fleeing the inner suburbs to get away from minorities who make money and thus can move into suburbia.