I found this map gallery of religion in the United States really interesting. The maps are divided into percentages of residents in every county in the country affiliated with that particular denomination.
The Baptist church completely dominates the south, but not much of the rest of the country, while the majority of Catholics are in the northeast. I'll give you one guess as to where the Mormon church has its strongest presence.
The Presbyterian Church is pretty equally spread throughout the country and not dominate in any certain area. I am not sure why this is, or if it is a good or bad thing.
Check out your church's denomination.