Herndon, Va. is a suburb of Washington, D.C., in the heart of the area's tech corridor and right next to Dulles Airport.

It's also the most obscene city in America, as determined by analyzing data from Google.

To find the most obscene cities in America, we plugged the "seven dirty words you can never say on television" -- made popular by the George Carlin bit -- into Google Trends, displaying 2009 results from U.S. cities.

We gave each city a score for each of the seven words, assigning more points to cities ranking higher up on each list.

Click here to see the 10 most obscene U.S. cities →

Herndon -- a surprise, we admit -- won the final tally, appearing in the top ten cities for six of the seven words, including three first-place finishes. It replaces Louisville, Ky., which came in first place in our list last year.

What's the point? Why did we do all this?

During the summer of 2008, a defense attorney in an obscenity case planned to use Google search data in a Pensacola, Fla. court to prove that the city's morals were abnormally lax, as indicated by residents' search terms. (The client ended up accepting a plea bargain, meaning the Google Trends evidence was never introduced to court.)

But that inspired us to run the numbers on Carlin's "seven dirty words," which put Louisville in first place.

More than a year later, Louisville's local CBC affiliate WLKY ran a piece about it last week, so we figured we'd update our rankings. Congratulations to our friends in Kentucky, who cleaned up their act and now rank no. 10.