Cities enjoy being identified as safe and affordable. Being labeled as having a lot of bed bug treatments, not so much.

Rollins, the corporation that owns seven pest control companies, including Orkin, says it has seen a 33.6 percent increase in bed bug business compared to 2010. The company has just released its rankings of U.S. cities in order of the number of bed bug treatments from January to December 2011.

And the winner is Cincinnati. Chicago is ranked second, followed by Detroit, Denver and Los Angeles. The report says L.A. moved from 25th to fifth on the list.

Several of the top 50 cities have large, busy airports, and there could be a correlation between increased travel and bed bug activity. The changes could also be because the bed bug population is increasing overall, or even because the public is becoming more aware of bed bugs and has become better adept at identifying them.