TN: The Knox. News Sentinel reported that Obama won Knoxville by 3,000 votes - though that only covered majority-city precincts. The precinct boundaries are relatively close to the city boundaries, though there could be enough exceptions to put Romney over the top, but I do not have enough knowledge of Knox Co. to say for sure. If I had to guess, I'd say Obama won Knoxville 800-1,000 votes.
The next candidate would be Clarksville. Using DRA, the 2008 results are very very close, with a slight Obama win. With a 2.4% swing for the county, its likely that Romney won Clarksville.
Are you serious? WOW, the rest of Knox must be Uber Republican. Romney won at least 63% in Knox right? I actually just checked on Dave's App and Obama won Knoxville 51-47 to McCain. While the rest of the county, which holds more population than the city, went 69-29 McCain while the county overall went 61-38. In 2012 the county went 64-34 and if the city was roughly tied, then the rest of the county voted around 74% Romney. Insane man, we really are in the biggest Urban-Rural divide we've ever been in.
Interestingly, Knoxville itself vote for secession during the Civil War, while rural East Tennessee (including Knox County as a whole) was staunchly pro-Union. Today, Knoxville votes for the black presidential candidate, while rural East Tennessee strongly opposes him. I just find that to be a tiny bit ironic.