Christianity is the most prevalent religion in every one of the 50 United States, and in all but one of the country’s counties. But what comes in second? The Washington Post gives us maps telling us what the second-most practiced faith in America is for each state. Another map breaks it down into counties, in case you want to check your local area, and there is a third map showing the largest Christian denominations in each county. The data is from a 2010 survey. -via Metafilter
Christianity is in fact the largest single group in all 3,143 US counties and county equivalents. The county in question (Emporia city, Virginia) originally had Muslim as the dominant religion. Once the Muslim adherent totals were corrected it turned out that Christianity was still the largest group.